Pertanyaan

Hitung pH NaCN 0,1 M (Ka HCN = 4 x 10 -6 ) !

Hitung pH NaCN 0,1 M (Ka HCN = 4 x 10^-6) !

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E. Dwihermiati

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Jawaban

pH NaCN adalah 9,2

Pembahasan

NaCN merupakan garam basa, hasil reaksi antara basa kuat dan asam lemah. Berdasarkan hidrolisis garam, penentuan pH menggunakan rumus maka, Jadi, pH NaCN adalah 9,2

NaCN merupakan garam basa, hasil reaksi antara basa kuat dan asam lemah.

Berdasarkan hidrolisis garam, penentuan pH menggunakan rumus

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of K subscript w over K subscript a middle dot open square brackets Garam close square brackets end root end style

maka,

$begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 4 middle dot 10 to the power of negative sign 6 end exponent end fraction middle dot left square bracket 0 comma 1 right square bracket end root space space space space space space space space space space space equals square root of 10 to the power of negative sign 9 end exponent over 4 end root space space space space space space space space space space equals square root of 0 comma 25 space middle dot 10 to the power of negative sign 9 end exponent end root space space space space space space space space space space equals space square root of 2 comma 5 middle dot 10 to the power of negative sign 10 end exponent end root space space space space space space space space space space equals 1 comma 58 middle dot 10 to the power of negative sign 5 end exponent end style$

Jadi, pH NaCN adalah 9,2