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Hitung pH larutan KCN 0,1 M ( K a ​ = 1 0 − 5 )

Hitung pH larutan KCN 0,1 M ()

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J. Siregar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Jawaban

pH larutan KCN adalah 9.

pH larutan KCN adalah 9.

Pembahasan

KCN adalah garam yang bersifat basa dimana pada reaksi hidrolisis dihasilkan ion . Jadi, pH larutan KCN adalah 9.

KCN adalah garam yang bersifat basa dimana pada reaksi hidrolisis dihasilkan ion begin mathsize 14px style O H to the power of minus sign end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K C N end cell rightwards arrow cell K to the power of plus sign and C N to the power of minus sign end cell row cell C N to the power of minus sign and H subscript 2 O end cell rightwards harpoon over leftwards harpoon cell H C N and O H to the power of minus sign end cell row blank blank blank row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of K subscript w over K subscript a cross times open square brackets K C N close square brackets cross times valensi end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 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 cross times 1 end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of 10 to the power of negative sign 10 end exponent end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 10 to the power of negative sign 5 end exponent end cell row blank blank blank row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row pOH equals cell negative sign log space 10 to the power of negative sign 5 end exponent end cell row pOH equals 5 row pH equals cell 14 minus sign pOH end cell row pH equals cell 14 minus sign 5 end cell row pH equals 9 end table end style  


Jadi, pH larutan KCN adalah 9.

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