<span>1) h2so4+2koh=k2so4+2h2o
2h</span>⁺ + so4²⁻ + 2k⁺ + 2oh⁻ = 2k⁺ + so4²⁻<span> + 2h2o
2h</span>⁺ + 2oh⁻ = 2h2o
2) <span>mg(oh)2+na2co3=2naoh+mgco3
ma(oh)2 + 2na</span>⁺ + co3⁻ = 2na⁺ + 2oh⁻<span> + mgco3
</span>ma(oh)2 + co3⁻ = 2oh⁻<span> + mgco3
</span>3) <span>2agno3+k2s=2kno3+ag2s
</span>2ag⁺ + 2no3⁻ + 2k⁺ + s⁻ = 2k⁺ + 2no3⁻<span> + ag2s
</span>2ag⁺ + s⁻ = <span>ag2s</span><span>
</span>
<span>K2O ( оксид калия )
</span><span>AlBr3 ( бромид алюминия )</span>