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Factors Affecting Alpha

For each pair...

Question

For each pair of chemicals below, the amounts shown are dissolved, together, in water to make 1.0 L of solution. Which mixture will form a buffer solution?

0.2 mol of

H C l

and 0.1 mol of

K_{2} {S O}_{3}

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0.2 mol of

N a O H

and 0.4 mol of

H F

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0.1 mol of

H B r

and 0.1 mol of

B a {(O H)}_{2}

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0.4 mol of

H C l

and 0.2 mol of

{N H}_{3}

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0.2 mol of

N a O H

and 0.4 mol of

H C l

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Solution

The correct option is B 0.2 mol of $N a O H$ and 0.4 mol of $H F$
A buffer solution is an aqueous solution consisting of a mixture of an acid and its conjugate base. Its $p H$ changes very little when a small amount of strong acid or base is added to it. Hence solution of $N a O H / H F$ is a buffer solution.

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For each pair of chemicals below, the amounts shown are dissolved, together, in water to make 1.0 L of solution. Which mixture will form a buffer solution?

The correct option is B 0.2 mol of NaOH and 0.4 mol of HFA buffer solution is an aqueous solution consisting of a mixture of an acid and its conjugate base. Its pH changes very little when a small amount of strong acid or base is added to it. Hence solution of NaOH/HF is a buffer solution.