Question

Explain Vinegar rs reaction with phenolphthalin Indicator on regtbmithy orange i boticated​

Answer 1

Explanation:

Acetic acid is a weak acid having a pH value of more than 6. Sodium hydroxide is a strong base and addition of OH

−

ions neutralizes the H

+

ions formed by the dissociation of acetic acid. Since H

+

ion concentration is very low, the addition of further OH

−

ions increases the pH value abruptly. Therefore, the titration range of this reaction lies between 6.5 to 10.0. The pH range of phenolphthalein is 8.2 to 10.0 and hence it undergoes colour change in this range. Hence it acts as a suitable indicator for this titration.