某化學(xué)興趣小組對(duì)實(shí)驗(yàn)室留置的NaOH的變質(zhì)程度進(jìn)行探究.先稱取13.3gNaOH樣品(雜質(zhì)為Na
2CO
3 ),配制成50g溶液,然后向溶液中逐滴加入質(zhì)量分?jǐn)?shù)為14.6%稀鹽酸,實(shí)驗(yàn)測(cè)得加入稀鹽酸的質(zhì)量與產(chǎn)生CO
2 氣體的質(zhì)量關(guān)系如圖.試計(jì)算:
(1)有多少克NaOH發(fā)生了變質(zhì)?
(2)反應(yīng)所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)是多少?