Ch. 15 Buffer Solution

Ch. 15 Buffer Solution

10th Grade - University

8 Qs

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Ch. 15 Buffer Solution

Ch. 15 Buffer Solution

Assessment

Quiz

Chemistry

10th Grade - University

Hard

Created by

Alison Klein

Used 11+ times

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8 questions

Show all answers

1.

MULTIPLE SELECT QUESTION

30 sec • 8 pts

The following solution mixture which is/are buffer . . .(you can select more than one)

H2PO4-1 and HPO42-

NH3 and (NH4)2SO4

HCOOH and Ba(HCOO)2

H3PO4 and NaH2PO4

NaOH and Ba(HCOO)2

2.

MULTIPLE CHOICE QUESTION

30 sec • 4 pts

Which of the following mixtures of solutions that can form a buffer solution are . . .

50 mL CH3COOH 0.2 M and 50 mL NaOH 0.1 M

50 mL CH3COOH 0.2 M and 0 mL NaOH 0.2 M

50 mL HCl 0.2 M and 100 mL NH4OH 0.1 M

50 mL HCl 0.1 M and 50 mL NH4OH 0.2 M

50 mL HCl 0.2 M and 100 mL NaOH 0.1 M

3.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

Media Image

Acidic buffer is made up of

weak acid and weak base
weak acid and its conjugate salt
weak acid and its conjugate base
strong acid and its conjugate base

4.

MULTIPLE SELECT QUESTION

30 sec • 5 pts

Which of the following statements ARE TRUE about buffer solution?


(you may choose more than one answer)

pH of buffer solution will never change despite addition of small amount of base or acid

Buffer can be made by mixing weak acid and salt of its conjugate base or by mixing weak base with salt of its conjugate acid

Buffer has acid and base components that can work specifically to resist pH change

the closer the ratio of concentration weak acid/base to the concentration of salt of its conjugate base/acid, the less effective the buffer to resist pH change

5.

MULTIPLE SELECT QUESTION

30 sec • 5 pts

What statements CAN BE TRUE about acidic buffer?


(you may choose more than one answer)

It's made of a mixture of weak acid and salt of its conjugate base

Concentration of H+ ions in acidic buffer is greater than concentration of OH- ions which is present in the solution

Dilution of buffer by adding small amount of water doesn't change the pH of buffer solution

acidic buffer have a pH greater than the pKa

6.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What statement is true about basic buffer?

basic buffer will have a pH greater than the pKa

It's made of a mixture of strong base and salt of its conjugate acid

adding small amount of strong acid to the solution of basic buffer can significantly alter the pH of the buffer solution

diluting solution of basic buffer cause pH of that solution to change drastically

7.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

a buffer solution is made of mixture of aqueous methanoic acid, HCOOH, with aqueous sodium methanoate, NaHCOO.


the equilibrium reaction takes place in buffer solution is :

HCOOH ↔ HCOO- + H+


small amount of NaOH is then added to that buffer solution.


What reaction take places at the buffer solution to resist change of pH caused by addition of base?

HCOOH + H+ → HCOOH2

HCOO- + H+ → HCOOH

HCOOH + OH- → HCOO- + H2O

HCOO- + OH- → COO2- + H2O

8.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

a buffer solution is made of mixture of aqueous ethanoic acid, CH3COOH, with aqueous potassium ethanoate, KCH3COO.


the equilibrium reaction takes place in buffer solution is :

CH3COOH ↔ CH3COO- + H+


small amount of HCl is then added to that buffer solution.


What reaction take places at the buffer solution to resist change of pH caused by addition of acid?

CH3COO- + H+ → CH3COOH

CH3COO- + OH- → CH2COO2- + H2O

CH3COOH + H+ → CH3COOH2

CH3COOH + OH- → CH3COO- + H2O