Question

（2000?長(zhǎng)沙）某溫度下，將質(zhì)量分?jǐn)?shù)為a%d的某溶液的濃度增大一倍，你可采用哪些方法？

Answer 1

分析：根據(jù)溶質(zhì)的質(zhì)量分?jǐn)?shù)=

溶質(zhì)質(zhì)量

溶液質(zhì)量

×100%求解即可．

解答：解：溶質(zhì)的質(zhì)量分?jǐn)?shù)=

溶質(zhì)質(zhì)量

溶液質(zhì)量

×100%，所以增加溶質(zhì)的質(zhì)量可以使溶液的濃度增大一倍；溶質(zhì)質(zhì)量不變，蒸發(fā)溶劑的質(zhì)量蒸發(fā)掉溶液質(zhì)量的一半．
故答案：增加溶質(zhì)；蒸發(fā)溶劑．

點(diǎn)評(píng)：題考查了有關(guān)溶質(zhì)質(zhì)量分?jǐn)?shù)的簡(jiǎn)單計(jì)算．解答該題時(shí)，要弄清楚溶液中的溶質(zhì)、溶液的質(zhì)量．