Question

圖是病人輸液時(shí)用的一瓶葡萄糖注射液的標(biāo)簽，請(qǐng)根據(jù)標(biāo)簽給出的數(shù)據(jù)，計(jì)算該注射液中含水質(zhì)量是多少？密度約為多少？（濃度就是溶質(zhì)質(zhì)量分?jǐn)?shù)）

Answer 1

考點(diǎn)：有關(guān)溶質(zhì)質(zhì)量分?jǐn)?shù)的簡(jiǎn)單計(jì)算

專題：溶液的組成及溶質(zhì)質(zhì)量分?jǐn)?shù)的計(jì)算

分析：根據(jù)題意，一瓶該注射液中含葡萄糖12.5g，溶質(zhì)質(zhì)量分?jǐn)?shù)為5%，據(jù)此結(jié)合溶液質(zhì)量=溶質(zhì)質(zhì)量÷溶質(zhì)質(zhì)量分?jǐn)?shù)，進(jìn)行分析解答即可．

解答：解：一瓶該注射液中含葡萄糖12.5g，溶質(zhì)質(zhì)量分?jǐn)?shù)為5%，一瓶該注射液的質(zhì)量為12.5g÷5%=250g；溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量，則該注射液中含水質(zhì)量是250g-12.5g=237.5g．
密度為

250g

250mL

=1g/mL．
答：該注射液中含水質(zhì)量是237.5g；密度為1g/mL．

點(diǎn)評(píng)：本題難度不大，掌握溶質(zhì)質(zhì)量分?jǐn)?shù)的有關(guān)計(jì)算并能靈活運(yùn)用是正確解答本題的關(guān)鍵．