例一、\x09将80克40%的硫酸钾稀释为20%的稀硫酸需要加入水多少克?将100克10%的食盐溶液

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m = 80*40%/20% - 80 = 80g；m = 100 - 100*10%/20% = 50g.
H2SO4%=(98%*1.84*35 + 10%*1.07*472)/(1.84*35 + 1.07*472)
S=100*8/10=80；KCl%=(92*80/180 + 3)/100