When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature ? Explain.

Explanation

To determine whether the white crystalline solid formed when an aqueous solution of borax is acidified with hydrochloric acid is acidic or basic in nature, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are borax (Na2B4O7) and hydrochloric acid (HCl).

2. **Write the Reaction**:
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