To prevent table salt from absorbing moisture and to make it flow freely certain additives are added to table salt . Name one such compound and explain how does it work ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Problem**: Table salt (sodium chloride, NaCl) tends to absorb moisture from the air, which can cause it to clump together and not flow freely. This is a common issue in humid environments.

2. **Understanding Hygroscopic Substances**: The impurities in table salt, such as magnesium chloride (MgCl2) and calcium chloride (CaCl2), are hygroscopic. This means they have a tendency to attract and hold onto water molecules from the surrounding environment.

3. **Additives to Prevent Moisture Absorption**: To prevent table salt from absorbing moisture, certain additives are included. One common additive is calcium carbonate (CaCO3) or calcium silicate (CaSiO3). These compounds help to absorb moisture without themselves becoming too wet.

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