Question

含溶質(zhì)a g，溶劑b g的溶液，溶質(zhì)的質(zhì)量分?jǐn)?shù)是（ ）
A．×100%
B．×100%
C．×100%
D．×100%

Answer 1

【答案】分析：這是關(guān)于溶質(zhì)的質(zhì)量分?jǐn)?shù)的簡(jiǎn)單計(jì)算，計(jì)算時(shí)根據(jù)：溶質(zhì)的質(zhì)量/（溶質(zhì)的質(zhì)量+溶劑的質(zhì)量）×100%進(jìn)行計(jì)算即可．
解答：解：溶液中含溶質(zhì)a g，溶劑b g，溶液的質(zhì)量=溶質(zhì)的質(zhì)量+溶劑的質(zhì)量=ag+bg，溶質(zhì)的質(zhì)量分?jǐn)?shù)為a/（a+b）×100%．
點(diǎn)評(píng)：溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)可以用下式計(jì)算：溶質(zhì)的質(zhì)量/（溶質(zhì)的質(zhì)量+溶劑的質(zhì)量）×100%．
由公式可以看出，溶質(zhì)質(zhì)量分?jǐn)?shù)的大小由溶質(zhì)質(zhì)量和溶液質(zhì)量決定，或者說溶質(zhì)質(zhì)量分?jǐn)?shù)的大小由溶質(zhì)質(zhì)量和溶劑質(zhì)量決定，在溶質(zhì)質(zhì)量不變的情況下，溶劑越多，溶質(zhì)質(zhì)量分?jǐn)?shù)則越小．