Question

Q. What volume of 0.1M CH,COOH is to be added
to 50 ml of 0.2M Na-acetate to prepare a buffer
solution of pH = 4.91 ?
​

Answer 1

Answer:

55 ml of volume of 0.1M  is to be added to 50ml of 0.2 M Na acetate to prepare a buffer solution of pH 4.91.

To find:

The volume of “0.1 mole of acetic acid”.

Solution:

By using the formula of the pH,

pH of acetic acid=4.74

=4.91-4.74=0.17

Number of moles of sodium acetate in the solution

=0.01 mol

Suppose volume of 0.2 M acetic acid added =V ml

Number of moles of acetic acid

V=55 ml

Then, 55 ml of 0.1 Mole of “acetic acid is needed” to add in the given condition.

Explanation:

Answer 2

Answer:

55 ml of volume of 0.1M is to be added to 50ml of 0.2 M Na acetate to prepare a buffer solution of pH 4.91.

To find:

The volume of “0.1 mole of acetic acid”.

Solution:

By using the formula of the pH,

pH of acetic acid=4.74

=4.91-4.74=0.17

Number of moles of sodium acetate in the solution

=0.01 mol

Suppose volume of 0.2 M acetic acid added =V ml

Number of moles of acetic acid

V=55 ml

Then, 55 ml of 0.1 Mole of “acetic acid is needed” to add in the given condition.

Explanation:

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