Question

When sodium acetate is added to aqueous solution of acetic acid, then why does the ph value increase?​

Answer 1

Answer:

CH3 OONa formed by reaction of sodium hydroxide (NaOH) and acetic acid (CH3COOH).

Acetic acid is a weak acid and sodium hydroxide is a strong base.

Thus , sodium acetate (CH3COONa) is basic in nature.

When sodium acetate added to aq. solution of acetic acid which is acidic in nature, the concentration of H+ decreases.

So , there is an increase in the pH of the solution.

Answer 2

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Here, sodium acetate is known as the sodium ethanoate and acetic acid is known as the ethanoic acid.

When sodium ethanoate is added to aqueous solution of acetic acid, then why does the pH value increases.

As we know that, Sodium acetate is formed by the neutralization reaction of sodium hydroxide which is a very strong base and acetic acid which is weak acid. So, the basic salt is formed. Therefore, Sodium acetate is basic in nature.

Dissociation of ethanoic acid is suppressed by the addition of Sodium ethanoate to the common ion called ethanoate ion effect. The hydronium ion decreases raising the pH of the acidic solution.

As we know that, after the addition of Sodium acetate to the ethanoic acid, a buffer solution is formed which has reserved pH value.