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Gas HCl murni 48 mL ditiupkan ke dalam 125 mL air ...

Gas HCl murni 48 mL ditiupkan ke dalam 125 mL air sehingga seluruh gas larut dan tidak mengubah volume air. Tekanan gas semula 76 cmHg dan temperaturnya 27°C. Jika tetapan gas ideal adalah R = 0,08 L.atm/mol.K, log 2 = 0,30, maka pH larutan HCl adalah....

Jawaban:

Pada gas ideal berlaku persamaan berikut.
 

begin mathsize 14px style P V double bond nRT end style
 

Maka jumlah gas HCl yang direaksikan sebagai berikut.
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row n equals cell fraction numerator P V over denominator RT end fraction end cell row blank equals cell fraction numerator 1 cross times 0 comma 048 over denominator 0 comma 08 cross times 300 end fraction end cell row blank equals cell fraction numerator 0 comma 048 over denominator 24 end fraction end cell row blank equals cell 0 comma 002 space mol end cell end table end style
 

Konsentrasi HCl dalam air:
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript HCl end cell equals cell n over V end cell row blank equals cell fraction numerator 0 comma 002 over denominator 0 comma 125 end fraction end cell row blank equals cell 0 comma 016 end cell row blank equals cell 16 cross times 10 to the power of negative sign 3 end exponent end cell row blank blank blank row cell open square brackets H to the power of plus sign close square brackets end cell equals cell valensi space asam cross times M end cell row blank equals cell 1 cross times 16 cross times 10 to the power of negative sign 3 end exponent end cell row blank equals cell 16 cross times 10 to the power of negative sign 3 end exponent end cell row blank blank blank row pH equals cell negative sign log open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log left parenthesis 16 cross times 10 to the power of negative sign 3 end exponent right parenthesis end cell row blank equals cell 3 minus sign log 16 end cell row blank equals cell 3 minus sign log 2 to the power of 4 end cell row blank equals cell 3 minus sign 4 log 2 end cell row blank equals cell 3 minus sign 4 left parenthesis 0 comma 3 right parenthesis end cell row blank equals cell 3 minus sign 1 comma 2 end cell row blank equals cell 1 comma 8 space end cell end table end style
 

Maka, pH larutan HCl tersebut adalah 1,8.

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