Cambridge Secondary (7-9). Stage 9. MCE Science. Student Book - Unit 7: Salts - Question 36

A farmer notices that the soil in his field is too acidic for growing his crops. He neutralises the soil by adding calcium carbonate (limestone). After some time, the farmer collects a sample of the soil and sends it to a laboratory for analysis. The soil was found to contain calcium chloride.

Explain how calcium chloride was formed in the soil. Write a balanced chemical equation for the reaction.