Frequently Asked Question

Questions asked by users might not always be phrased in the clearest way.

Consider a solution which is 0.10 m in CH3COOH and 0.20 m in NaCH3COO. Which of the following statements is true?rnselect one:rna.if a small amount of NaOH is added, the ph decreases very slightly.rnb.if a small amount of HCl is added, the ph decreases very slightly.rnc.if HCl is added, the h+ ions react with CH3COOH ions.rnd.if NaOH is added, the OH- ions react with the CH3COO- ions.

Accepted Answer

The correct answer is:
d.If NaOH is added, the OH- ions react with the CH3COO- ions.



The solution is a buffer solution. The addition of a small amount of a strong acid or base will not change the pH very much. The H+ ions from the acid will react with the CH3COO- ions to form CH3COOH, and the OH- ions from the base will react with the CH3COOH to form CH3COO-. This will keep the concentrations of H+ and CH3COO- ions relatively constant, and the pH will not change very much.


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