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

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

Jawaban:

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

$begin mathsize 14px style Na C N equilibrium Na to the power of plus sign and C N to the power of minus sign end style$

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,

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

$begin mathsize 14px style pOH equals minus sign log space open square brackets O H to the power of minus sign close square brackets space space space space space space space equals space minus sign log space 1 comma 58 space cross times 10 to the power of negative sign 5 end exponent space space space space space space space equals space 5 minus sign log 1 comma 58 space space space space space space space equals space 5 minus sign 0 comma 2 space space space space space space space equals 4 comma 8 pH space equals 14 minus sign pOH space space space space space space equals 14 minus sign left parenthesis 4 comma 8 right parenthesis space space space space space space equals space 9 comma 2 end style$

Jadi, pH NaCN adalah 9,2

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