Chemistry 2003 JAMB Past Questions - Question 43: The leachate of a certain plant ash is used in local scap-making because it contains.

Correct Answer

D

Explanation

 The leachate of a plant ash used in soap-making typically contains soluble carbonates and hydrogen carbonates. These compounds contribute to the alkalinity of the leachate, making it suitable for saponification reactions. Saponification is the process of making soap by reacting fats or oils with a strong alkaline solution, and in this case, the alkaline components in the leachate help facilitate the formation of soap.

In the context of your options:

- **Sodium chloride (NaCl)** is common table salt and is not typically found in plant ashes in significant amounts.
 
- **Sodium hydroxide (NaOH)** is a strong base and is commonly used in soap-making, but it's not typically found in plant ashes. It is usually produced separately for industrial use.

- **Potassium hydroxide (KOH)** is another strong base and is commonly used in soap-making, especially for making liquid soaps. Like sodium hydroxide, it is not typically found in plant ashes in significant amounts.

- **Soluble carbonates and hydrogen carbonates** are the compounds most likely present in the leachate of plant ash used in soap-making. They provide the alkalinity necessary for saponification.

So, the correct option in the context of soap-making from plant ash leachate is likely "soluble carbonates and hydrogen carbonates."