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2 K⁺ + 2 OH⁻ + 2 H⁺ + SO₃²⁻ --------> 2 K⁺ + SO₃²⁻ + 2 H₂O
2 OH⁻ + 2 H⁺ -------> 2 H₂O | :2
OH⁻ + H⁺ -------> H₂O
b) 2 HI + Pb(NO₃)₂ ------> PbI₂↓ + 2 HNO₃
2 H⁺ + 2 I⁻ + Pb²⁺ + 2 NO₃⁻ ------> PbI₂↓ + 2 H⁺ + 2 NO₃⁻
2 I⁺ + Pb²⁺ --------> PbI₂↓