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Larutan Zn ( OH ) 2 ​ memiliki pH = 9 + log 2, tentukan nilai Ksp Zn ( OH ) 3 ​ !

Larutan  memiliki pH = 9 + log 2, tentukan nilai Ksp!

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G. Suprobo

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

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Jawaban

Ksp adalah .

Ksp begin mathsize 14px style Zn open parentheses O H close parentheses subscript 3 end style adalah begin mathsize 14px style 2 comma 7 x 10 to the power of negative sign 3 end exponent end style.

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Pembahasan

Jadi, Ksp adalah .

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row cell 9 plus log space 2 end cell equals cell 14 minus sign pOH end cell row pOH equals cell 14 minus sign left parenthesis 9 plus log space 2 right parenthesis end cell row blank equals cell 6 minus sign log space 2 end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log open square brackets O H to the power of minus sign close square brackets end cell row cell 6 minus sign log space 2 end cell equals cell negative sign log open square brackets O H to the power of minus sign close square brackets end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 x 10 to the power of negative sign 6 end exponent end cell row blank blank blank end table end style 

begin mathsize 14px style Zn open parentheses O H close parentheses subscript 2 equilibrium Zn to the power of 2 plus sign and 2 O H to the power of minus sign space s space space space space space space space space space space space space space space space space s space space space space space space space space space 2 s end style   

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 s end cell row cell 2 x 10 to the power of negative sign 6 end exponent end cell equals cell 2 s end cell row s equals cell 10 to the power of negative sign 6 end exponent end cell end table end style 

begin mathsize 14px style Zn open parentheses O H close parentheses subscript 3 equilibrium Zn to the power of 3 plus sign and 3 O H to the power of minus sign s space space space space space space space space space space space space space space space space space space space s space space space space space space space space space space space 3 s end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Ksp space Zn open parentheses O H close parentheses subscript 3 end cell equals cell open square brackets Zn to the power of 3 plus sign close square brackets open square brackets O H to the power of minus sign close square brackets cubed equals s point left parenthesis 3 s right parenthesis cubed equals s point 27 s cubed end cell row blank equals cell 27 s to the power of 4 end cell row blank equals cell 27 left parenthesis 10 to the power of negative sign 6 end exponent right parenthesis to the power of 4 equals 27 x 10 to the power of negative sign 24 end exponent end cell row blank equals cell 2 comma 7 x 10 to the power of negative sign 23 end exponent end cell row blank blank blank row blank blank blank end table end style 

Jadi, Ksp begin mathsize 14px style Zn open parentheses O H close parentheses subscript 3 end style adalah begin mathsize 14px style 2 comma 7 x 10 to the power of negative sign 3 end exponent end style.

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