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Tentukan pH NH4​Cl 0,1 M (Kb​=10−5)!

Pertanyaan

Tentukan pH N H subscript bold 4 Cl bold space bold 0 bold comma bold 1 bold space italic M (K subscript italic b bold equals bold 10 to the power of bold minus sign bold 5 end exponent)!

M. Dwiyanti

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta

Jawaban terverifikasi

Jawaban

pH dari garam N H subscript bold 4 Cl bold space bold 0 bold comma bold 1 bold space italic M adalah 5.

Pembahasan

N H subscript 4 Cl merupakan garam yang bersifat asam karena berasal dari larutan asam kuat dan basa lemah. Spesi yang mengalami hidrolisis adalah N H subscript 4 to the power of plus sign, konsentrasinya adalah:

N H subscript 4 Cl yields N H subscript 4 to the power of plus sign and Cl to the power of minus sign 0 comma 1 space M space space space space space 0 comma 1 space M

1. Menentukan nilai OH- :

open square brackets H to the power of plus sign close square brackets equals square root of K subscript W over K subscript b cross times M end root open square brackets H to the power of plus sign close square brackets equals square root of 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent cross times 0 comma 1 space M end root open square brackets H to the power of plus sign close square brackets equals square root of 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent cross times 10 to the power of negative sign 1 end exponent space M end root open square brackets H to the power of plus sign close square brackets equals square root of 10 to the power of negative sign 15 end exponent over 10 to the power of negative sign 5 end exponent end root open square brackets H to the power of plus sign close square brackets equals square root of 10 to the power of negative sign 10 end exponent end root open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 5 end exponent

2. Menentukan pH :

pH equals minus sign log space open square brackets H to the power of plus sign close square brackets pH equals minus sign log space left square bracket 10 to the power of negative sign 5 end exponent right square bracket pH equals 5 

Jadi, pH dari garam N H subscript bold 4 Cl bold space bold 0 bold comma bold 1 bold space italic M adalah 5.

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