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Sebanyak 50 mL larutan  0,1 M (Kb) dicampur dengan 100 mL larutan  0,5 M. Hitunglah pH larutan tersebut!

Pertanyaan

Sebanyak 50 mL larutan begin mathsize 14px style N H subscript 3 end style 0,1 M (Kbbegin mathsize 14px style equals space 10 to the power of negative sign 5 end exponent end style) dicampur dengan 100 mL larutan begin mathsize 14px style N H subscript 4 Cl end style 0,5 M. Hitunglah pH larutan tersebut!

Pembahasan Soal:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mmol space N H subscript 3 end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 space M cross times 50 space mL end cell row blank equals cell 5 space mmol end cell end table end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mmol space N H subscript 4 Cl end cell equals cell M cross times V end cell row blank equals cell 0 comma 5 space M cross times 100 space mL end cell row blank equals cell 50 space mmol end cell end table 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 Kb cross times begin inline style b over g end style end cell row blank equals cell 10 to the power of negative sign 5 end exponent cross times begin inline style 5 over 50 end style end cell row blank equals cell 10 to the power of negative sign 6 end exponent space M 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 space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space 10 to the power of negative sign 6 end exponent end cell row blank equals 6 end table end style


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 blank equals cell 14 minus sign 6 end cell row blank equals 8 end table end style


Jadi, pH nya adalah 8.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 April 2021

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