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（1）将该温度下a mL pH='13' NaOH溶液与b mL0.05mol/L H 2 SO 4 混合，所得混合溶液的pH=7， 则a:b = （2）若在含有足量AgCl固体的饱和AgCl溶液中分别放入： A．100mL蒸馏水中； B．100mL 0.2 mol·L －1 AgNO 3 溶液中； C．100 mL 0.1 mol·L －1 AlCl 3 溶液中； D．100mL 0.1 mol·L －1 盐酸溶液中。 充分搅拌后，银离子浓度最小的是 （填序号） （3）在25℃下，向浓度均为0.20 mol·L -1 的MgCl 2 和CuCl 2 混合溶液中逐滴加入氨水，先生成 沉淀（填化学式），生成该沉淀的离子方程式为 ；当测得溶液pH=11.00时，则此温度下残留在溶液中的c(Mg 2+ ):c(Cu 2+ )= （已知25℃时K sp [Mg(OH) 2 ]=1.8×10 -11 ，K sP [Cu(OH) 2 ]=2.0×10 -20 ）
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