有含盐6%的盐水40克.要配制成含盐20%的盐水应该加入多少克盐
有含盐6%的盐水40克.要配制成含盐20%的盐水应该加入多少克盐
化学人气：929 ℃时间：2019-09-27 13:10:05
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m质/m液=A％m溶质=40g×6％=2.4gm水=40g—2.4g=37.6g解设加入Xg盐(2.4g+Xg)/(40g+Xg)=20％2.4g+Xg=8g+0.2Xg0.8Xg=5.6gX=7g答：需加入7g盐.【若加入5.6g.则根据溶质质量分数的公式可知：（2.4+5.6）/（40+5.6）=17.5...
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