3Ca(NO₃)₂ + 2Na₃PO₄ = Ca₃(PO₄)₂↓ + 6NaNO₃
3Ca²⁺ + 6NO₃⁻ + 6Na⁺ + 2PO₄³⁻ = Ca₃(PO₄)₂↓ + 6Na⁺ + 6NO₃⁻
3Ca²⁺ + 2PO₄³⁻ = Ca₃(PO₄)₂↓
ZnCl₂ + K₂S = ZnS↓ + 2KCl
Zn²⁺ + 2Cl + 2K⁺ + S²⁻ = ZnS↓ + 2K⁺ + 2Cl⁻
Zn²⁺ + S²⁻ = ZnS↓
1) HСO-O-C3H7 + HOH = HCOOH + C3H7OH