题目

按要求填空: I.(1)AlCl3的水溶液 pH______7(填>、=、<=,其原因为______________(用离子方程式表示),将其溶液加热蒸干并灼烧最终得到物质是                     (填化学式)。 (2)常温下,Cr(OH)3的溶度积Ksp=c(Cr3+)·c3(OH−)=10−32,要使c(Cr3+)降至10−5mol/L,溶液的pH应调至             。 (3)物质的量浓度相同的三种溶液:①NH4Cl ②氨水 ③NH4HSO4,c(NH4+)大小顺序正确的是______________。(用序号表示) (4)常温下两种溶液:a.pThe medicine ___ as soon as you take it. But it ____ the blood.A.brings into effect; effectsB.takes effect; has a bad effect onC.comes into effect; has little effect onD.is carried into effect; has much effect on
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