Procedure C involves the addition of hydrochloric acid to limestone samples in columns 1 and 2. The reason the limestone in column 1 is thinner than the limestone in column 2 is likely due to the differences in the rates of reaction between the two columns.
- Higher Reactivity: Limestone in column 1 may have a higher reactivity compared to column 2, leading to a faster reaction with hydrochloric acid and therefore a more rapid dissolution.
- Greater Surface Area: The limestone in column 1 may have a greater surface area exposed to the hydrochloric acid compared to column 2, facilitating a faster reaction and resulting in more significant erosion.
- Different Composition: The limestone samples in columns 1 and 2 could have variations in their composition, with the limestone in column 1 containing more susceptible components to acid dissolution, resulting in greater erosion.
- Acid Concentration: There might be differences in the concentration of hydrochloric acid added to each column, influencing the rate of reaction and consequently the degree of erosion observed.