31.取一定量NaCl和NaHCO
3組成的固體樣品放入燒杯中,然后將一定溶質(zhì)質(zhì)量分?jǐn)?shù)的鹽酸逐滴加入到樣品中,邊加邊攪拌,測得生成氣體的質(zhì)量與所加鹽酸的質(zhì)量關(guān)系如圖所示。請(qǐng)分析并計(jì)算:
(1)恰好完全反應(yīng)時(shí)產(chǎn)生氣體的質(zhì)量是
g;
(2)a點(diǎn)時(shí)溶液中含有的溶質(zhì)是
(填化學(xué)式);
(3)計(jì)算所加鹽酸的溶質(zhì)質(zhì)量分?jǐn)?shù)。(寫出計(jì)算過程,結(jié)果精確到0.01%)