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Sebanyak 50 ml begin mathsize 14px style open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript end style 0,1 M dicampur dengan 50 ml larutan begin mathsize 14px style N H subscript 3 end style 0,1 M begin mathsize 14px style left parenthesis K subscript b equals 10 to the power of negative sign 5 end exponent right parenthesis end style. Tentukan pH campuran yang terjadi!

E. Dwihermiati

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Jawaban

pH campuran adalah 8+log5.

Pembahasan

Menentukan nilai mol larutan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript end subscript end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 space mol space L to the power of negative sign 1 end exponent cross times 0 comma 05 space L end cell row blank equals cell space 0 comma 005 space mol end cell end table end style 

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript N H subscript 3 end subscript end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 space mol space L to the power of negative sign 1 end exponent cross times 0 comma 05 space L end cell row blank equals cell space 0 comma 005 space mol end cell end table end style 

Menentukan nilai pH campuran penyangga basa

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 K subscript b cross times n subscript N H subscript 3 end subscript over n subscript N H subscript 4 to the power of plus end subscript end cell row blank equals cell 10 to the power of negative sign 5 end exponent cross times fraction numerator 0 comma 005 over denominator 0 comma 01 end fraction end cell row blank equals cell space 5 cross times 10 to the power of negative sign 6 end exponent end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic p O H space end cell equals cell space minus sign space log open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell space minus sign space log space 5 cross times 10 to the power of negative sign 6 end exponent end cell row blank equals cell space 6 space minus sign space log space 5 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic p H space end cell equals cell space 14 space minus sign space italic p O H end cell row blank equals cell space 14 space minus sign left parenthesis 6 minus sign log space 5 right parenthesis end cell row blank equals cell space 8 space plus space log space 5 end cell end table end style 

Jadi, pH campuran adalah 8+log5.

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