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[H+]=√CK

C=30g/(60g/mol❌0.1L)=5mol/L

∴[H+]=√5❌2❌10^-5=1❌10^-2(mol/L)

∴pH=-log(1.0❌10^-2)=2.0

理解できました。ありがとうございます🙇‍♀️

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