初中關(guān)于質(zhì)量分數(shù)最?？嫉木褪侨芤旱馁|(zhì)量分數(shù)了
溶液中溶質(zhì)質(zhì)量分數(shù)的計算
溶質(zhì)的質(zhì)量分數(shù)是溶質(zhì)質(zhì)量與溶液質(zhì)量之比.初中化學(xué)中常用百分數(shù)來表示.溶液中溶質(zhì)質(zhì)量分數(shù)的計算式如下：
溶質(zhì)的質(zhì)量分數(shù)=溶質(zhì)質(zhì)量/溶液質(zhì)量×100%
溶質(zhì)質(zhì)量分數(shù)的計算題可以有：
(1)已知溶質(zhì)和溶劑的質(zhì)量,求溶液的質(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+溶劑質(zhì)量)×100%
(2)已知溶液的質(zhì)量和它的質(zhì)量分數(shù),求溶液里所含溶質(zhì)和溶劑的質(zhì)量.
溶質(zhì)質(zhì)量=溶液的質(zhì)量x質(zhì)量分數(shù) 溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量
(3)將一已知濃度的溶液加入一定量的水進行稀釋,或加入固體溶質(zhì),求稀釋后或加入固體后的溶液的質(zhì)量分數(shù).
利用稀釋后溶質(zhì)質(zhì)量不改變 從而進行相對應(yīng)的計算
還要注意在混合溶質(zhì)里的反應(yīng) 例如生成了氣體、沉淀