Why salt bridge is made up of saturated solution of `KNO_(3)` in agar–agar.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Salt Bridge:**
A salt bridge is a device used in electrochemical cells to maintain electrical neutrality by allowing the flow of ions between the two half-cells. It prevents the buildup of charge that would otherwise stop the reaction.

2. **Composition of the Salt Bridge:**
The salt bridge is typically made from a saturated solution of potassium nitrate (KNO₃) mixed with agar-agar. Agar-agar serves as a gel-like medium that holds the solution in place, preventing it from spilling and allowing for stable ion movement.

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