The solution compares two curves representing the reaction between marble chips and hydrochloric acid. What is the question asking to identify?

The problem describes an initial experiment (Curve 1) where 5 grams of lump marble chips react with an excess of dilute hydrochloric acid at $30^\circ\text{C}$. Curve 1 shows the volume of gas produced over time.

Curve 2, compared to Curve 1, shows two key differences:

1. A steeper initial slope: This indicates a faster rate of reaction.
2. A higher final volume of gas produced: This indicates that more product (carbon dioxide) was formed in total.

Let's analyze each option:

• A. Stirring the reacting mixture regularly: Stirring increases the rate of reaction by ensuring reactants are constantly in contact. This would make the curve steeper. However, stirring does not change the total amount of