Hard water forms lather with soap easily.

Answer

**Step-by-Step Solution:**

1. **Understanding Hard Water**: Hard water is water that contains a high concentration of dissolved minerals, primarily calcium (Ca²⁺) and magnesium (Mg²⁺) ions.

2. **Soap Composition**: Soap is typically made from sodium salts of fatty acids. A common example is sodium stearate, which has the chemical formula C17H35COONa.

3. **Reaction of Soap with Hard Water**: When soap is added to hard water, the calcium and magnesium ions in the hard water react with the soap. This reaction forms insoluble compounds known as "scum."

4. **Formation of Scum**: The calcium ions (Ca²⁺) or magnesium ions (Mg²⁺) displace the sodium ions (Na⁺) in the soap. For example, the reaction can be represented as:
\[ 2 \text{C}_{17}\text{H}_{35}\text{COO}^- + \text{Ca}^{2+} \rightarrow \text{C}_{17}\text{H}_{35}\text{COO}_2\text{Ca} + \text{Na}^+ \]
This results in the formation of calcium stearate, which is insoluble in water and precipitates out as scum.

5. **Effect on Lather Formation**: Because scum is formed instead of lather, hard water does not allow soap to create a good lather. The presence of scum inhibits the soap's ability to clean effectively.

6. **Conclusion**: Therefore, the statement "Hard water forms lather with soap easily" is **false**. Soft water, which lacks these minerals, forms lather easily with soap.

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