What is the function of Rochelle salt in Fehling's solution ?

Explanation

### Step-by-Step Solution:

1. **Understanding Fehling's Solution**:
Fehling's solution is a chemical test used to differentiate between aldehydes and ketones. It consists of two solutions: Fehling's solution A (which contains copper(II) sulfate, CuSO4) and Fehling's solution B (which contains sodium potassium tartrate, also known as Rochelle salt, along with sodium hydroxide).

2. **Components of Fehling's Solution**:
- **Fehling's Solution A**: Contains CuSO4, which provides Cu²⁺ ions.
- **Fehling's Solution B**: Contains sodium potassium tartrate (Rochelle salt) and sodium hydroxide. The tartrate acts as a complexing agent.
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