課題3　溶質(zhì)的質(zhì)量分數(shù)1

1、課題3 溶質(zhì)的質(zhì)量分數(shù)第九單元之第九單元之一、溶液組成的表示方法一、溶液組成的表示方法u正確理解正確理解“濃濃”和和“稀稀”溶液溶液u溶質(zhì)的質(zhì)量分數(shù)溶質(zhì)的質(zhì)量分數(shù)溶質(zhì)質(zhì)量溶質(zhì)質(zhì)量溶液質(zhì)量溶液質(zhì)量= =100%= =溶質(zhì)質(zhì)量溶質(zhì)質(zhì)量溶質(zhì)質(zhì)量溶質(zhì)質(zhì)量+ +溶劑質(zhì)量溶劑質(zhì)量100%二、溶質(zhì)質(zhì)量分數(shù)的計算二、溶質(zhì)質(zhì)量分數(shù)的計算u稀釋的計算稀釋的計算u現(xiàn)有現(xiàn)有100g100g質(zhì)量分數(shù)為質(zhì)量分數(shù)為20%20%的的NaClNaCl溶液，溶液，需加多少水將其稀釋為質(zhì)量分數(shù)為需加多少水將其稀釋為質(zhì)量分數(shù)為10%10%的的NaClNaCl溶液？溶液？u現(xiàn)在有質(zhì)量分數(shù)分別為現(xiàn)在有質(zhì)量分數(shù)分別為10%10%和和30%

2、30%的的KNOKNO3 3溶液，它們以何種質(zhì)量比混合能形成溶液，它們以何種質(zhì)量比混合能形成質(zhì)量分數(shù)為質(zhì)量分數(shù)為20%20%的的KNOKNO3 3溶液。溶液。u增濃的計算增濃的計算u有有40g40g溶質(zhì)質(zhì)量分數(shù)為溶質(zhì)質(zhì)量分數(shù)為5%5%的氯化鈣溶液，的氯化鈣溶液，若將其溶質(zhì)質(zhì)量分數(shù)增加到若將其溶質(zhì)質(zhì)量分數(shù)增加到10%10%，可采用，可采用什么法？并算出具體的數(shù)值。什么法？并算出具體的數(shù)值。二、溶質(zhì)質(zhì)量分數(shù)的計算二、溶質(zhì)質(zhì)量分數(shù)的計算u根據(jù)化學方程式進行計算根據(jù)化學方程式進行計算u6.5g6.5g鋅粒與鋅粒與100g100g稀硫酸恰好完全反應(yīng)，求稀硫酸恰好完全反應(yīng)，求稀硫酸的質(zhì)量分數(shù)。稀硫酸的質(zhì)量分數(shù)。二、溶質(zhì)質(zhì)量分數(shù)的計算二、溶質(zhì)質(zhì)量分數(shù)的計算三、配制一定溶質(zhì)質(zhì)量分數(shù)的溶液三、配制一定溶質(zhì)質(zhì)量分數(shù)的溶液u1 1、計算計算：溶質(zhì)和溶劑的質(zhì)量：溶質(zhì)和溶劑的質(zhì)量u2 2、稱量和量取稱量和量取u3 3、溶解溶解：攪拌至充分溶解：攪拌至充分溶解u4 4、裝瓶裝瓶u配制溶液配制溶液時常