醫(yī)療上用的生理鹽水是0.9%的氯化鈉溶液,500g生理鹽水含氯化鈉________g;取用10%的氯化鈉溶液90g,可配制0.9%的氯化鈉溶液________g.
4.5 1000
分析:根據(jù)溶質(zhì)質(zhì)量=溶液質(zhì)量×溶質(zhì)質(zhì)量分數(shù)即可計算出500g生理鹽水含氯化鈉的質(zhì)量;再根據(jù)加水稀釋前后溶液中溶質(zhì)質(zhì)量不變,即可計算加水稀釋后溶液的質(zhì)量.
解答:0.9%生理鹽水500g含溶質(zhì)氯化鈉的質(zhì)量為:
500g×0.9%=4.5g.
設(shè)可配制0.9%的氯化鈉溶液的質(zhì)量為x,
則:x×0.9%=90g×10%
解得:x=1000g.
故答案為:4.5,1000.
點評:本題考查了有關(guān)溶質(zhì)質(zhì)量分數(shù)的簡單計算;解答本題的根據(jù)是要掌握溶液在稀釋前后溶質(zhì)的質(zhì)量是不變的.