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100 ml  0,25 M direaksikan dengan 100 ml  0,125 M!...

100 ml begin mathsize 14px style K O H end style 0,25 M direaksikan dengan 100 ml begin mathsize 14px style H subscript 2 S O subscript 4 end style 0,125 M!

Hitunglah :

a.  pH larutan sebelum dicampurkan

b.  pH setelah dicampurkan

Jawaban:

a)  pH larutan sebelum dicampurkan

pH larutan begin mathsize 14px style K O H 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 b cross times M end cell row blank equals cell 1 cross times 0 comma 25 end cell row blank equals cell 0 comma 25 space M end cell row pOH equals cell negative sign log open parentheses O H to the power of minus sign close parentheses end cell row blank equals cell negative sign log open parentheses 25 cross times 10 to the power of negative sign 2 end exponent close parentheses end cell row blank equals cell 2 minus sign log 25 end cell row blank equals cell 0 comma 6 end cell row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign 0 comma 6 end cell row blank equals cell 13.4 end cell end table end style 


pH larutan begin mathsize 14px style H subscript 2 S O subscript 4 end style 


begin mathsize 14px style 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 a cross times M end cell row blank equals cell 2 cross times 0 comma 125 end cell row blank equals cell 0 comma 25 space M end cell row pH equals cell negative sign log open parentheses H to the power of plus sign close parentheses end cell row blank equals cell negative sign log open parentheses 25 cross times 10 to the power of negative sign 2 end exponent close parentheses end cell row blank equals cell 2 minus sign log 25 end cell row blank equals cell 0 comma 6 end cell end table end style 


b)  pH setelah dicampur

Mula-mula kita hitung dulu mol dari kedua senyawa


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mol space K O H end cell equals cell M cross times V end cell row blank equals cell 0 comma 25 cross times 0 comma 1 end cell row blank equals cell 0 comma 025 space mol end cell end table end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mol space H subscript 2 S O subscript 4 end cell equals cell M cross times V end cell row blank equals cell 0 comma 125 cross times 0 comma 1 end cell row blank equals cell 0 comma 0125 space mol end cell end table end style 


Kemudian hitung mol saat bereaksi


 


Karena asam kuat dan basa kuat habis beraksi, maka pH larutan menjadi netral = 7.

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