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【毎日一問】理論基礎 2020.07.21

2020-07-21View Original

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選択問題:pH=2のHCl溶液とpH=13のNaOH溶液を同じ体積で混ぜた後の溶液のpH値は( ) A、7.00 B、12.65 C、3.00 D、11.00 答え:B ヒント:解き方の過程を説明できる人には特別な報酬があります。答えは返信で確認できます
Reply #22020-07-21
pHは水素イオン濃度の負の対数です。溶液を混ぜると体積が2倍になるため、HClの濃度は0.005M、NaOHの濃度は0.05Mとなります。これら2つを混ぜると酸塩基反応が起こり、溶液中の過剰なNaOHの濃度はc=(0.1-0.01)/2=0.045 mol.L-1となります。したがって、pHは12.65です

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