稱取NaCl和BaCl
2的固體混合物32.5g,加入82.8g水完全溶解,向該溶液中逐滴加入溶質(zhì)質(zhì)量分?jǐn)?shù)為10%的Na
2SO
4溶液。反應(yīng)生成BaSO
4沉淀的質(zhì)量與所加入的Na
2SO
4溶液的質(zhì)量關(guān)系如圖所示。試回答下列問題:
(1)恰好完全反應(yīng)時(shí)消耗Na
2SO
4溶液的質(zhì)量是多少克?
(2)恰好完全反應(yīng)時(shí)所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)是多少?