1) An aqueous solution contains 0.22 M ammonium perchlorate . One liter of this
ID: 494125 • Letter: 1
Question
1) An aqueous solution contains 0.22 M ammonium perchlorate.
One liter of this solution could be converted into a buffer by the addition of:
(Assume that the volume remains constant as each substance is added.)
0.10 mol KOH
0.21 mol NaClO4
0.10 mol HCl
0.21 mol NH3
0.22 mol HCl
2)
An aqueous solution contains 0.33 M hydrofluoric acid.
One Liter of this solution could be converted into a buffer by the addition of:
(Assume that the volume remains constant as each substance is added.)
0.33 mol KNO3
0.165 mol KOH
0.16 mol HNO3
0.34 mol KF
0.34 mol HNO3
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3)
An aqueous solution contains 0.20 M potassium cyanide.
One liter of this solution could be converted into a buffer by the addition of:
(Assume that the volume remains constant as each substance is added.)
0.19 mol HCN
0.20 mol HBr
0.19 mol KI
0.10 mol KOH
0.10 mol HBr
Explanation / Answer
Buffer is an aqueous solution of a mixture of weak acid and its conjugate base or vice versa
1) An aqueous solution contains 0.22 M ammonium perchlorate.
One liter of this solution could be converted into a buffer by the addition of:
Answer: 0.21 mol NH3
2) An aqueous solution contains 0.33 M hydrofluoric acid.
One Liter of this solution could be converted into a buffer by the addition of:
Answer: 0.34 mol KF
3) An aqueous solution contains 0.20 M potassium cyanide.
One liter of this solution could be converted into a buffer by the addition of:
Answer: 0.19 mol HCN
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