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【毎日一問】理論基礎 2020.07.25

2020-07-25View Original

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選択問題:Kθb(NH3) = 1.77×10⁻⁵である。0.2 molL⁻¹のNH3.H2O溶液と0.2 molL⁻¹のHCl溶液を等容混合した場合、その混合溶液のpH値は( ) A、5.12 B、8.87 C、1.63 D、9.73 答え:A ヒント:解法の過程を説明できた人には追加の報酬があります。答えは返信で確認できます
Reply #22020-07-25
同じモル濃度で、質量が等しい2種類の酸と塩基を混ぜると完全に反応し、生成される塩化アンモニウムは強酸弱塩基塩なので、bとdはすぐ除外できます。cのpHはおよそ1で、ちょっと奇妙なので、私はaを選ぶと思います(推測ですので、皆さんは真に受けないでください)

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