15问答网 > 用30%和80%的两种硫酸溶液来配制50g40%的硫酸溶液,需要30％的硫酸溶液和80的硫酸溶液的

用30%和80%的两种硫酸溶液来配制50g40%的硫酸溶液,需要30％的硫酸溶液和80的硫酸溶液的

2025-03-17 06:07:24
推荐回答（2个）
回答1：

设需要30％的硫酸溶液为m，80的硫酸溶液的n
m+n=50
m x30% + n x 80%=50 x 40%
解上述方程组，得：m=40g，n=10g
即需要30％的硫酸溶液为40克，80的硫酸溶液的10克。

回答2：

80%与30%溶液的质量比是（40-30）/（80-40）=10/40=1/4
需要80%的溶液50*1/5=10克
需要30%的溶液50*4/5=40克

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