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Sebanyak 0,2 mol NaOH dimasukkan ke dalam 1 L laru...

Sebanyak 0,2 mol NaOH dimasukkan ke dalam 1 L larutan C H subscript 3 C O O H 0,3 M K subscript a equals 2 cross times 10 to the power of negative sign 5 end exponent maka ph campuran adalah ...

Jawaban:

Menentukan jumlah mol C H subscript 3 C O O H:

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 3 cross times 1 end cell row blank equals cell 0 comma 3 space mol end cell end table 

Reaksi yang terjadi:

 

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell K subscript a cross times n subscript C H subscript 3 C O O H end subscript over n subscript C H subscript 3 C O O Na end subscript end cell row blank equals cell 2 cross times 10 to the power of negative sign 5 end exponent cross times fraction numerator 0 comma 1 over denominator 0 comma 2 end fraction end cell row blank equals cell 10 to the power of negative sign 5 end exponent space M end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell italic p H end cell equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space 10 to the power of negative sign 5 end exponent end cell row blank equals 5 end table 

Jadi, ph campuran yang benar adalah 5.

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