
Ch. 15 Buffer Solution
Authored by Alison Klein
Chemistry
10th Grade - University
Used 11+ times

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8 questions
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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
Acidic buffer is made up of
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
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