Question

（2003?四川）配制0.9%的醫(yī)用生理鹽水500g，需氯化鈉

4.5

g，蒸餾水

495.5

g．

Answer 1

分析：利用一定量溶液中溶質(zhì)質(zhì)量=溶液質(zhì)量×溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)，可根據(jù)溶液的質(zhì)量和溶液的質(zhì)量分?jǐn)?shù)計(jì)算配制溶液所需要的溶質(zhì)的質(zhì)量；再根據(jù)溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量即可求得蒸餾水的質(zhì)量．

解答：解：因?yàn)槿苜|(zhì)質(zhì)量=溶液質(zhì)量×溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)，
故配制0.9%的醫(yī)用生理鹽水500g，需氯化鈉的質(zhì)量=500g×0.9%=4.5g；
又知：溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量；
則所需蒸餾水的質(zhì)量=500g-4.5g=495.5g．
故答案為：4.5；495.5．

點(diǎn)評：本題考查了有關(guān)溶質(zhì)質(zhì)量分?jǐn)?shù)的有關(guān)計(jì)算，溶液質(zhì)量=溶質(zhì)質(zhì)量+溶劑質(zhì)量．