Pb(NO₃)₂ + Na₂S = PbS↓ + 2NaNO₃
Pb²⁺ + 2NO₃⁻ + 2Na⁺ + S²⁻ = PbS↓ + 2Na⁺ + 2NO₃⁻
Pb²⁺ + S²⁻ = PbS↓
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Pb(NO₃)₂ + Na₂S = PbS↓ + 2NaNO₃
Pb²⁺ + 2NO₃⁻ + 2Na⁺ + S²⁻ = PbS↓ + 2Na⁺ + 2NO₃⁻
Pb²⁺ + S²⁻ = PbS↓