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50 mL larutan  0,5 M () direaksikan dengan 50 mL l...

50 mL larutan C H subscript 3 C O O H 0,5 M (K subscript a equals 10 to the power of negative sign 5 end exponent) direaksikan dengan 50 mL larutan NaOH 0,5 M. Besarnya pH campuran ialah ...

Jawaban:

Menentukan nilai mol larutan:

table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript C H subscript 3 C O O H end subscript end cell equals cell M cross times V end cell row blank equals cell 0 comma 5 cross times 50 end cell row blank equals cell 25 space mmol end cell row blank equals cell 0 comma 025 space mol end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript NaOH end cell equals cell M cross times V end cell row blank equals cell 0 comma 5 cross times 50 end cell row blank equals cell 25 space mmol end cell row blank equals cell 0 comma 025 space mol end cell end table 

Persamaan reaksi:

 

Menentukan nilai pH campuran:

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 square root of K subscript w over K subscript a cross times open square brackets C H subscript 3 C O O Na close square brackets end root end cell row blank 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 025 end root end cell row blank equals cell square root of 25 cross times 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell 5 cross times 10 to the power of negative sign 6 end exponent space M end cell end table 

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

table attributes columnalign right center left columnspacing 0px end attributes row cell italic p H end cell equals cell 14 minus sign italic p O H end cell row blank equals cell 14 minus sign left parenthesis 6 minus sign log space 5 right parenthesis end cell row blank equals cell 8 plus log space 5 end cell row blank equals cell 8 comma 7 end cell end table 

Oleh karena itu, pH campuran adalah 8,7.

Jadi, jawaban yang benar pH campuran adalah 8,7.

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