PQ-30. What is the pH of a solution that results from mixing 25.0 mL of 0.200 M HA with 12.5 mL of 0.400 M NaOH? (Ka = 1.0× 10-5) (C) 9.06 (D) 11.06 (B) 4.94 (A) 2.94

Answers

Answer 1

None of the given answer choices match the calculated pH, none of the options (A), (B), (C), or (D) are correct.

How to find the pH of the resulting solution?

To find the pH of the resulting solution, we need to determine the concentration of the resulting solution's hydronium ion (H₃O+).

First, let's calculate the number of moles of HA and NaOH used:

Moles of HA = volume (L) × concentration (M) = 0.025 L × 0.200 M = 0.005 mol

Moles of NaOH = volume (L) × concentration (M) = 0.0125 L × 0.400 M = 0.005 mol

Since NaOH is a strong base and HA is a weak acid, the reaction between them will form water and the conjugate base of HA. Therefore, the moles of HA and NaOH are equal, resulting in a complete neutralization.

Now, let's determine the concentration of the resulting solution's hydronium ion (H₃O+):

Moles of H₃O+ = Moles of HA = 0.005 mol

Volume of resulting solution = volume of HA + volume of NaOH = 0.025 L + 0.0125 L = 0.0375 L

Concentration of H₃O+ = Moles of H₃O+ / Volume of resulting solution = 0.005 mol / 0.0375 L = 0.133 M

Finally, let's calculate the pH of the resulting solution:

pH = -log[H₃O+]

   = -log(0.133)

   ≈ 0.877

Rounding to two decimal places, the pH of the resulting solution is approximately 0.88.

Since none of the given answer choices match the calculated pH, none of the options (A), (B), (C), or (D) are correct.

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Related Questions

magnesium__ + sulfuric acid goes to form magnesium sulfate+ water + carbon dioxide​

Answers

Answer:

carbonate

Explanation:

this is because when carbonates react with acid they form carbon dioxide and water and respective metal oxide

A gas in a piston starts out with a volume of 156 mL, a temperature of 28.1° C, and a pressure of 1.12 atm. If it ends with a volume of 312 mL and a temperature of 87.2° C, what is the new pressure?

Answers

Answer:

0.67atm is the new pressure of the gas

Explanation:

To find one condition of a gas when pressure, volume and absolute temperature change we must use combined gas law:

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

Where P is pressure, V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.

Replacing:

P₁ = 1.12atm

V₁ = 156mL

T₁ = 28.1°C + 273.15K = 301.25K

P₂ = ?

V₂ = 312mL

T₂ = 87.2°C + 273.15 = 360.35K

1.12atm*156mL / 301.25K = P₂*312mL / 360.35K

P₂ = 0.67atm is the new pressure of the gas

Im gonna ride it do it just how you like it and after that let's do it?
what is the answer of this.

Answers

Answer:

the hell?

Explanation:

dababy............................

Dona is attempting to make an electromagnetic to pick up old nails in her driveway. Which of these materials would be best to us for the core to make the strongest electromagnetic to pick up the most nails?

Answers

Answer:

The materials would be best to us for the core to make the strongest electromagnetic to pick up the most nails is described below in detail.

Explanation:

Use a couple of wire strip-pers to exclude some centimeters of insulation from every end of the cable. Skillfully cover the cable around the nail. The more cable you enclose around the nail, the more effective your electromagnet will be. Compose certain that you leave sufficient of the cable unwrapped so that you can connect the battery.

How many grams of carbon is needed to react with hydrogen gas to produce 59.8 grams of acetylene (C2H2)?

Answers

Answer:

[tex]55.1657[/tex] grams/mol of carbon is needed to react with hydrogen gas to produce 59.8 grams of acetylene (C2H2)

Explanation:

The molecular weight of acetylene is  26.04 g/mol

Molecular weight of carbon is equal to 12.011 g/mol

Two carbon atom produces one acetylene molecule.

Thus, 2 * 12.011 g/mol of carbon is used to produce  26.04 g/mol of acetylene,

Amount of carbon required to produce 59.8 grams of acetylene

[tex]\frac{2*12.011}{26.04} * 59.8 \\= 55.1657[/tex]grams/mol

[tex]55.1657[/tex] grams/mol of carbon is needed to react with hydrogen gas to produce 59.8 grams of acetylene (C2H2)

How do parasites affect their hosts?
They help their hosts by consuming or using their cells.
They help their hosts by growing in size.
O They harm their hosts by growing in size.
They harm their hosts by using their hosts as a food source.

Answers

The last one seems right to me

How does a sugar solution become rock candy?

Answers

Answer:

Explanation:

A supersaturated solution is unstable—it contains more solute (in this case, sugar) than can stay in solution—so as the temperature decreases, the sugar comes out of the solution, forming crystals. The lower the temperature, the more molecules join the sugar crystals, and that is how rock candy is created.

Explain why a halogen bulb has a longer bulb life than a traditional incandescent bulb filled with argon.

Answers

Answer:

The halogen bulb lasts longer because the filament lasts longer. It can have twice the life of an incandescent and use the same amount or slightly less (10%) electricity.

Explanation:

Every ________ will have its own unique set of quantum numbers.
Select the correct answer below:

A. atom

B. shell of electrons

C.proton

D. individual electron

Answers

Answer:

D. individual electron

Explanation:

Every individual electron  will have its own unique set of quantum numbers.

What are quantum numbers?

Quantum numbers are the numbers which describe the values of conserved quantities with respect to the dynamics of a quantum system.They correspond to the Eigen values of operators which commute with the Hamiltonian quantities.

The Hamiltonian quantities can be known with precision simultaneously with the system's energy.Quantum numbers can take values of discrete sets of integers or even half-integers even though they can approach infinity in some cases.

They can specifically describe energy levels of electrons, and can also explain angular momentum,spin,etc.These are used to describe the path of an electron in an atom ,when the quantum numbers of all atoms are combined they must comply with the Schrodinger equation.

Learn more about Quantum numbers,here:

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1. Which of the following is the most important function of the microscope?
A. measuring specimen
B. magnification of the specimen
C. photographing the specimen
D. locating and viewing the specimen
image or​

Answers

I think B magnification of the specimen


mass-mass problem:
If 25.0 grams of carbon dioxide are used in photosynthesis how many grams of glucose (C6H12O6) could be Produced according
to the following equation : 6CO2 + 6H2O → C6H12O6 + 602

Answers

Answer:

17.05 g of glucose

Explanation:

The equation of the reaction is given as;

6CO2 + 6H2O → C6H12O6 + 602

From the equation;

6 mol of CO2 produces 1 mol of  C6H12O6

Converting to masses;

CO2:

Mass =Number of moles * Molar mass

Mass = 6 mol * 44 g/mol = 264 g

C6H12O6:

Mass =  Number of moles * Molar mass

Mass = 1 mol * 180 g/mol = 180 g

This means 264g of CO2 produces 180g of C6H12O6

25g of CO2 would produce x g of C6H12O6

264 = 180

25 = x

x = 25 * 180 / 264

x = 17.05 g


The diagram shows movement of thermal energy
In which areas of the diagram does conduction occur?

W and X
X and Z
Y and Z
Z and W

Answers

Answer:

Y AND Z

HOPE IT HELPS THANK ME LATER.

Answer:

B. Y and Z

Explanation:

5.
Given: C2H5C1
P1: 951.72 kPa
P2: 362.29 kPa
T1: 653.34 K
Wanted: kelvins?

Answers

Answer: The final temperature is 248.7 K

Explanation:

To calculate the final temperature of the system, we use the equation given by Gay lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.

Mathematically,

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

where,

[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.

[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.

We are given:

[tex]P_1=951.72kPa\\T_1=653.34K\\P_2=362.29kPa\\T_2=?[/tex]

Putting values in above equation, we get:

[tex]\frac{951.72}{653.34}=\frac{362.29}{T_2}\\\\T_2=248.7K[/tex]

Thus the final temperature is 248.7 K

HELP ME PLEASE!!!
One liter of water is cooled from 20°C to 3°C inside a refrigerator. What is the change in temperature in °F? K?

Answers

Answer:

Decrease of temperature by 62.6°F and 290.15°

Explanation:

First identify change in C: 17 degrees

now convert to Fahrenheit and Kelvin

Fahrenheit: 17 * (9/5) +32 = 62.6°

Kelvin: 17 + 273.15 = 290.15°

What is a song that gets you in a mood? ;)

Answers

Happy by Pharrell Williams

Answer:

Uhm- s-- money- feelings- die? But, slowed -w-

Explanation:

Please help with chem ASAP

Answers

Answer:

Imagine Dragon

Explanation:

These balls across yo face

Gottem

I need help with this question ASAP

Answers

Answer:

True

Explanation:

Asexual reproduction does not involve sex cells or fertilization . Only one parent is required, unlike sexual reproduction which needs two parents. As a result, the offspring are genetically identical to the parent and to each other.

how does a allergy develop?


PLEASE HELP!

Answers

Allergies arise when a foreign material such as pollen, bee venom or pet dander responds to your immune system or a food that in most people does not cause a reaction. Substances known as antibodies are formed by your immune system.

Answer: im not fully sure but from what i rememeber Allergies develop when your immune system mistakenly identifies a thing such as pollen, mold or food as harmful then your body reacts to it

Explanation:

what is the equation for hydrogen peroxide

Answers

Answer:

H2O2

Explanation:

2 hydrogen, 2 oxygen wikipedia it

Answer:

hey!

Your answer is that the equation for Hydrogen Peroxide is [tex]H_{2}[/tex][tex]O_{2}[/tex]

Explanation:

Its formed when [tex]H_{2}[/tex]O and [tex]O_{2}[/tex] react chemically together!

HOPE THIS HELPED!

How does fertilizer affect nitrogen cycle

Answers

Cuando se usa demasiado fertilizante para las plantas una parte de ese nitrógeno no vuelve a la atmósfera y a cambio contamina el medio ambiente

Explanation:

the nitrogen cycle is a natural process that adds nitrogen to the soil. however the use of fertilizer has increased the amount of usable nitrogen in the soil

Convert 6.03 m to km using Dimensional Analysis

Answers

Explanation:

[tex]6.03 \: m \times \frac{1 \: km}{1000 \: m} = 0.00603 \: km[/tex]

After the shuttle disaster, an unknown compound residue was removed from a piece of the debris. Upon analysis, it was found to contain 2.61 g of carbon, 6.09 g of nitrogen, and 1.31 g of hydrogen. What is its empirical formula?

Answers

Answer:

The final empirical formula is [tex]C_2 N_5 H[/tex]

Explanation:

Given

The amount of carbon, nitrogen and hydrogen in a given compound is as follows

C:N:H

[tex]2.61 : 6.09 : 1.31[/tex]

On simplifying the ration values  we get

[tex]\frac{2.61}{1.31} : \frac{6.09}{1.31} : \frac{1.31}{1.31}[/tex]

So the final ratio is

[tex]2 : 5 : 1[/tex]

The final empirical formula is [tex]C_2 N_5 H[/tex]

Please help: A complete moon cycle is how many weeks

Answers

Answer:

29.5 days

Explanation:

its 29.5 days i hope it helps

Answer:

The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 day

BRAINLIEST AND POINTS!!
Describe three ways in which scientists communicate the results of their work.

Answers

Answer:

There are several ways that scientists communicate our results, including written reports and scientific journal publications, and by giving presentations to our colleagues and the public. One popular venue for scientists to present to colleagues is at scientific conferences.

Explanation:

Answer:

-Good writing explaining their data they have discovered

-Their research is shared with the other scientists, and is peer reviewed

-They present their results at national and international conferences where other scientists can listen and give their input.

Explanatio

Which of the following is true? Electrons are shared in ionic bonding

Answers

Answer:

The two most basic types of bonds are characterized as either ionic or covalent. In ionic bonding, atoms transfer electrons to each other. ... In contrast, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.

Explanation:

45 grams of ammonia, NH3, in 0.75 L of solution.

Answers

2.3 moles of sodium chloride in 0.45 liters of solution . necessarile correct ... 0.025 L. (1.3 SF). 45 grams of ammonia in 0.75 L of solution. 45g x 1 mol = 2. demol ... anol x 1,50 = 3 mol NaOH x 40,019 = 120g Naolt.

____Na3PO4+____CaCI2 --->____NaCI+ ____Ca(PO4)2

Answers

Answer:

3CaCi2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCi

Explanation:

What type of energy transformation happens during photosynthesis?
(select the BEST answer choice
thermal --> radiant
chemical --> radiant
chemical --> thermal
radiant --> chemical

Answers

Answer:

radiant - chemical is the best answer

1) Write the symbol and charge for each individual ion
2) Balance the charge so that they equal to zero
3)Write the formula based on how many of each ion you used in step 2


11) Beryllium and Phosphorus
12) cesium and Sulfur
13) Lithium and phosphorus
14) fluorine and rubidium
15) Francium and oxygen

Answers

Answer:

I'm pretty sure these are correct

11) Be 2+ and P 3-    Formula is Be3P2  

12) Cs 1+ and S 2-    Formula: Cs2S

13) Li 1+ and P 3-      Formula: Li3P

14) Rb 1+ and F 1-     Formula: RbF

15) Fr 1+ and O 2-    Formula: Fr2O

Explanation:

You do the criss-cross method where the charge on one ion becomes the amount on the second

Solid sodium combines with solution of magnesium fluoride to form sodium fluoride solution and magnesium metal.

Answers

Solid sodium combines with solution of magnesium fluoride to form sodium fluoride solution and magnesium metal is adding hydrochloric acid into form magnesium chloride solution and hydrogen gas. A solution could be copper oxide is combined with solid carbon. This forms copper metal and carbon dioxide gas.

Other Questions
Use the graph on the right to answer the following questions. a. Which of points A, B, C, or D can represent a long-run equilibrium? O D O A and C O B O A and B O B and D O A, B, C, and D HELP ME OUT PLEASE!!!!!! The notation "f(x)" (f of x) is another way of representing y-values in a function True False Write a paragraph explaining how the concept of total war affected the warring nations economies. A dispute over what island group resulted in a 1988 naval battle between china and vietnam, leaving 75 vietnamese sailors dead? How does an HEV work? Write to ratio as a fraction in simplest form, with whole numbers in the numerator and denominator. The image above shows the inner planets which plan is represented by the number two? How to fix "files required to play gta online could not be downloaded from the rockstar games service"? What does the dirty towel symbolize in Trifles? A baseball is pitched at 70 miles per hour (but instead use 31.29 meters/second). The baseball has a mass of 0.145 kg. The catcher catches the ball, and the catcher has 95.9 kg of mass. The catcher is originally stationary (not moving). What is the speed of the catcher (and the ball, combined) immediately after he catches the baseball? Evan is going to make a cake for his mother's birthday. It will take 26 minutes to make the cake batter, and the cake needs to bake in the oven for 1 hour and 13 minutes. If Evan wants the cake to be out of the oven by 12:39 P.M., what is the latest time he can start making the cake batter? The following question references the novel Mrs. Dalloway by Virginia Woolf. How does Peter feel once he has arrived at the party? a. He wishes he had not come c. He is delighted to be there b. He is surprised to see so many guests d. He is uneasy about having to speak with Richard A piece of bread is inserted into a toaster and begins to toast. Identify the correct statement.a The internal energy of the toaster decreases as the internal energy of the bread increasesb Heat enters the bread and the internal energy of the toaster decreasesc Work is done to the bread and the internal energy of the toaster decreasesd Work is done to the bread and heat enters the bread there are 25 spools each of blue , green , red , white ,and yellow thread in the sewing basket . without looking whats the probability of picking a spool of blue thread from the basket What types of tools will you use to support student learning and assess student progress? The rose bowl game is the oldest bowl game in college football history.a. Trueb. False What strategy do you use to multiply integers? Is 3x 2 exponential? Is every number a multiple of 8? 6. Which of the following is true about Anorexia Nervosa?It's not as serious as bulimiaOIt usually goes away on its ownOIt's serious but not life threateningOIt has consequences similar to malnutrition and starvation