把40毫升氢氧化钡溶液加入到120毫升盐酸中,所得溶液ph为2.如果混合前两溶液ph之和为14,求c(HCl)大约为02

来源：学生作业帮助网编辑：作业帮时间：2024/05/10 17:04:58

把40毫升氢氧化钡溶液加入到120毫升盐酸中,所得溶液ph为2.如果混合前两溶液ph之和为14,求c(HCl)大约为02
把40毫升氢氧化钡溶液加入到120毫升盐酸中,所得溶液ph为2.如果混合前两溶液ph之和为14,求c(HCl)大约为
02

把40毫升氢氧化钡溶液加入到120毫升盐酸中,所得溶液ph为2.如果混合前两溶液ph之和为14,求c(HCl)大约为02
设C(HCl)=a；C(Ba(OH)2)=b
由题知混合前pH和为14则有a=b
又有混合后{0.12a-0.04b}/(0.12+0.04) =10^-2
得a=b=2*10^-2=0.02
注意设浓度时象Ba(OH)2不会乘以2

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