QUESTION 1 If you have a solution with 1 mole of the base (CH 3 ) 3 N, which of

Question

QUESTION 1

If you have a solution with 1 mole of the base (CH3)3N, which of the following can be added to make a buffer? Choose all correct answers.

(CH

0.6 mol HCl

0.4 mol NaOH

(CH

1 mol NaOH

1 mol HCl

1 points   

QUESTION 2

Which of the following occurs when NaOH is added to a buffer containing (CH3)3N and (CH3)3NH+?  

Select all that apply.

The concentraion of

The pH will decrease.

The concentraion of

(CH

The pH will increase.

The concentraion of

1 points   

QUESTION 3

When NaOH is added to a HF / NaF buffer, what happens to the following values?

Concentration of HF

Concentration of F-?

pH

Decreases

Increases

1 points   

QUESTION 4

Of the following, which is the best base to create a buffer with a pH = 8.0?

Aniline, Kb = 4.3 x 10-10

Pyridine, Kb = 1.7 x 10-9

Ethylamine, K

Hydrazine, K

(CH

0.6 mol HCl

0.4 mol NaOH

(CH

1 mol NaOH

1 mol HCl

Explanation / Answer

Question 1

Buffer solution can be prepared by mixing an aqeous solution of weak base and its conjugate acid or vice-e-versa

Here base is (CH3)3N which is a weak base

Its conjugate acid (CH3)3NHCl or (CH3)3NHNO3

So both (CH3)3NHCl and (CH3)3NHNO3 can be used to make the buffer solution

Question 2

The concentraion of (CH3)3NH+ will decrease.

The concentraion of (CH3)3N will increase

Question 3

When NaOH is added to a HF / NaF buffer, what happens to the following values:

The Concentration of F- will increase

The concentration of HF will decrease

pH of the solution remain constant

Question 4

The best base to make the buffer is hydrazine

Kb of hydrzine is 1.3*10^-6 (so ka = 7.69 X 10-9) pKa = 8.11

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