Question

Emili cooked a hen egg until it was hard-boiled. He put the hen egg in a beaker of dilute hydrochloric acid (pH=2.5) as shown. The eggshell reacted completely with the acid. After two days the pH of the liquid in the beaker was 4. How did the acidity of the liquid in the beaker change? Explain.

Answer 1

Answer: it became less reactive

Explanation:due to the acid in the egg it became less reactive

Answer 2

The acidity of the liquid initially increased when the eggshell reacted with the hydrochloric acid, but as the reaction continued, the hydronium ions from the acid were consumed, raising the pH and making the solution less acidic.

Step-by-step explanation:

The acidity of the liquid in the beaker initially increased when the hard-boiled eggshell reacted with the dilute hydrochloric acid. Hydrochloric acid is a strong acid, and when it dissociates, it releases hydronium ions (H3O+), making the solution acidic with a pH less than 7.

As the eggshell reacted completely with the acid, all the hydronium ions from the acid were neutralized. When this happened, the pH of the solution increased and became closer to neutral, reaching a pH of 4 after two days of reaction.

This change in acidity occurred because the acid first increased the hydronium ion concentration, making the solution acidic, and then the reaction with the eggshell consumed the hydronium ions, raising the pH and making the solution less acidic.