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Pada suhu , . Hitunglah kelarutan  pada : a.  larutan  0,001 M, b.  larutan  0,001 M, c.  larutan yang mempunyai pH = 11, d.  larutan yang berisi  0,1 M dan  0,1 M

Pertanyaan

Pada suhu begin mathsize 14px style 25 space degree C end stylebegin mathsize 14px style K subscript sp space Ni open parentheses O H close parentheses subscript 2 equals 6 cross times 10 to the power of negative sign 18 end exponent end style. Hitunglah kelarutan begin mathsize 14px style Ni open parentheses O H close parentheses subscript 2 end style pada :

a.  larutan begin mathsize 14px style Na O H end style 0,001 M,

b.  larutan begin mathsize 14px style Ni Cl subscript 2 end style 0,001 M,

c.  larutan yang mempunyai pH = 11,

d.  larutan yang berisi begin mathsize 14px style N H subscript 3 end style 0,1 M dan begin mathsize 14px style N H subscript 4 Cl end style 0,1 M undefined

Pembahasan Soal:

begin mathsize 14px style Ni open parentheses O H close parentheses subscript 2 yields Ni to the power of 2 plus sign and 2 O H to the power of minus sign end style 


Dalam larutan jenuh begin mathsize 14px style Ni open parentheses O H close parentheses subscript 2 end style terdapat kesetimbangan 


begin mathsize 14px style Ni open parentheses O H close parentheses subscript 2 yields Ni to the power of 2 plus sign and 2 O H to the power of minus sign space space space space space space S space space space space space space space space space space space S space space space space space space space space 2 S end style 


Maka harga Ksp nya dinyatakan dalam :


Error converting from MathML to accessible text. 


a)  Penambahan 0,001 M NaOH

begin mathsize 14px style Na O H yields Na to the power of plus sign and O H to the power of minus sign 0 comma 001 space space space 0 comma 001 space space 0 comma 001 end style   


begin mathsize 14px style open square brackets ion space sejenis close square brackets equals open square brackets O H to the power of minus sign close square brackets equals 0 comma 001 equals 10 to the power of negative sign 3 end exponent end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp end cell equals cell open square brackets Ni to the power of 2 plus sign close square brackets middle dot open square brackets 2 O H to the power of minus sign close square brackets end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell S middle dot open square brackets 10 to the power of negative sign 3 end exponent close square brackets squared end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell S middle dot 10 to the power of negative sign 6 end exponent end cell row S equals cell 6 cross times 10 to the power of negative sign 12 end exponent space M end cell end table end style 


Jadi, kelarutan dalam 0,001 M NaOH adalah begin mathsize 14px style 6 cross times 10 to the power of negative sign 12 end exponent space M end style 

b)  Penambahan 0,001 M begin mathsize 14px style Ni Cl subscript 2 end style 


begin mathsize 14px style Ni Cl subscript 2 yields Ni to the power of 2 plus sign and 2 Cl to the power of minus sign 0 comma 001 space space space 0 comma 001 space space 0 comma 002 end style 


begin mathsize 14px style open square brackets ion space sejenis close square brackets equals open square brackets Ni to the power of 2 plus sign close square brackets equals 0 comma 001 equals 10 to the power of negative sign 3 end exponent end style 


 begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp end cell equals cell open square brackets Ni to the power of 2 plus sign close square brackets middle dot open square brackets 2 O H to the power of minus sign close square brackets end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell 10 to the power of negative sign 3 end exponent middle dot open parentheses 2 S close parentheses squared end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell 10 to the power of negative sign 3 end exponent middle dot 4 S squared end cell row cell 6 cross times 10 to the power of negative sign 15 end exponent end cell equals cell 4 S squared end cell row cell S squared end cell equals cell 1 comma 5 cross times 10 to the power of negative sign 15 end exponent end cell row S equals cell 3 comma 87 cross times 10 to the power of negative sign 8 end exponent space M end cell end table end style 


Jadi, kelarutan dalam 0,001 M undefined adalah begin mathsize 14px style 3 comma 87 cross times 10 to the power of negative sign 8 end exponent space M end style.

c)  Penambahan larutan pH 11


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals 11 row pOH equals 3 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 3 end exponent space M end cell end table end style 


begin mathsize 14px style open square brackets ion space sejenis close square brackets equals open square brackets O H to the power of minus sign close square brackets equals 0 comma 001 equals 10 to the power of negative sign 3 end exponent end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp end cell equals cell open square brackets Ni to the power of 2 plus sign close square brackets middle dot open square brackets 2 O H to the power of minus sign close square brackets end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell S middle dot open square brackets 10 to the power of negative sign 3 end exponent close square brackets squared end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell S middle dot 10 to the power of negative sign 6 end exponent end cell row S equals cell 6 cross times 10 to the power of negative sign 12 end exponent space M end cell end table end style 


Jadi, kelarutan dalam larutan pH 11 adalah begin mathsize 14px style 6 cross times 10 to the power of negative sign 12 end exponent space M end style.

d)  Penambahan larutan larutan yang berisi begin mathsize 14px style N H subscript 3 end style 0,1 M dan begin mathsize 14px style N H subscript 4 Cl end style 0,1 M undefined


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 Kb cross times fraction numerator open square brackets basa space lemah close square brackets over denominator open square brackets garam close square brackets end fraction end cell row blank equals cell 10 to the power of negative sign 5 end exponent cross times 1 over 1 end cell row blank equals cell 10 to the power of negative sign 5 end exponent space M end cell end table end style 


begin mathsize 14px style open square brackets ion space sejenis close square brackets equals open square brackets O H to the power of minus sign close square brackets equals open square brackets 10 to the power of negative sign 5 end exponent close square brackets end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp end cell equals cell open square brackets Ni to the power of 2 plus sign close square brackets middle dot open square brackets 2 O H to the power of minus sign close square brackets end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell S middle dot open square brackets 10 to the power of negative sign 5 end exponent close square brackets squared end cell row cell 6 cross times 10 to the power of negative sign 18 end exponent end cell equals cell S middle dot 10 to the power of negative sign 10 end exponent end cell row S equals cell 6 cross times 10 to the power of negative sign 8 end exponent space M end cell end table end style 


Jadi, kelarutan dalam larutan penyangga adalah begin mathsize 14px style 6 cross times 10 to the power of negative sign 8 end exponent space M end style.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 04 April 2021

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