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【简答题】
在 100mL 0.20mol∙L -1 MgCl 2 溶液中加入等体积的含有 NH 4 Cl 的 0.20mol∙L -1 NH 3 ∙H 2 O ,未生成 Mg(OH) 2 沉淀,计算原 NH 3 ∙H 2 O 溶液的 pH 值和 NH 4 Cl 的物质的量。( K b θ (NH 3 ∙H 2 O)=1.8×10 -5 , K sp θ (Mg(OH) 2 )=5.6×10 -12 )
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