問題詳情
6. KNO2（aq）25.0 mL 滴入酸後加入 0.020 M 的 KMnO4 溶液 54.0 mL，因加入過量再加入 4.0 mL 0.10 M 的 FeSO4（aq）才能褪色，則 KNO2 之濃度為多少 M？(____8____) M
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