An aqueous solution contains 0.18 M ammonium iodide . One liter of this solution

Question

An aqueous solution contains 0.18 M ammonium iodide.

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.)

0.17 mol CaI2

0.04 mol Ca(OH)2

0.08 mol HClO4

0.17 mol NH3

0.18 mol HClO4

An aqueous solution contains 0.35 M sodium nitrite.

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.)

0.34 mol HNO2

0.17 mol HClO4

0.35 mol HClO4

0.34 mol NaClO4

0.17 mol Ba(OH)2

An aqueous solution contains 0.22 M ammonia.

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.)

0.11 mol NaOH

0.23 mol NH4Cl

0.23 mol HBr

0.11 mol HBr

0.22 mol CaCl2

Explanation / Answer

Generally buffer solutions are used to resist the change in pH of the solution.

Generally we use acidic and basic buffers.

Acidic buffer :weak acid and it's salt with strong base like CH3COOH +CH3COONa

Basic buffer :weak base and it's salt with Storng acid like NH3 +NH4Cl

Hence

1. Option D, 0.17 mol NH3

2. Option A, 0.34 mol HNO2

3. Option B, 0.23 mol NH4Cl

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