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Larutan NH4​OH 0,2 M mempunyai nilai pH=11+log 2. Hitunglah nilai Kb​ NH4​OH tersebut.

Pertanyaan

Larutan N H subscript 4 O H 0,2 M mempunyai nilai pH equals 11 plus log space 2. Hitunglah nilai K subscript b space N H subscript 4 O H tersebut.

Q. 'Ainillana

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta

Jawaban terverifikasi

Pembahasan

N H subscript 4 O H termasuk asam lemah. Jumlah konsentrasi ion open square brackets O H to the power of minus sign close square brackets bergantung pada konsentrasi larutan basa dan tetapan kesetimbangan ioniasi open parentheses K subscript b close parentheses

open square brackets O H to the power of minus sign close square brackets equals square root of K subscript b cross times M end root 

Terlebih dahulu kita cari konsentrasi open square brackets O H to the power of minus sign close square brackets melalui nilai pH

pH equals 11 plus log space 2 pOH equals 14 minus sign left parenthesis 11 plus space log space 2 right parenthesis equals 3 minus sign log space 2 open square brackets O H to the power of minus sign close square brackets equals 2 cross times 10 to the power of negative sign 3 end exponent  open square brackets O H to the power of minus sign close square brackets equals square root of K subscript b cross times M space end root 2 cross times 10 to the power of negative sign 3 end exponent equals square root of K subscript b cross times 0 comma 2 space M end root space K subscript b equals fraction numerator 4 cross times 10 to the power of negative sign 6 end exponent over denominator 0 comma 2 space end fraction K subscript b equals 2 cross times 10 to the power of negative sign 5 end exponent 

Jadi, nilai K subscript b space N H subscript 4 O H sebesar 2 cross times 10 to the power of negative sign 5 end exponent.

 

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