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Larutan dibuat dengan menambahkan 2 mL HCl 5 M dan...

Larutan dibuat dengan menambahkan 2 mL HCl 5 M dan 2 mL begin mathsize 14px style H N O subscript 3 end style 5 M ke dalam air hingga volume campuran 1.000 mL. Hitung pH dan pOH larutan ini?

  1. horizontal ellipsis 

  2. undefined 

Jawaban:

Konsentrasi ion begin mathsize 14px style H to the power of plus sign end style masing-masing larutan sebelum dicampurkan adalah:


begin mathsize 14px style open square brackets H to the power of plus sign close square brackets space H Cl equals 5 M open square brackets H to the power of plus sign close square brackets space H N O subscript 3 equals 5 M end style 

 

Konsentrasi ion begin mathsize 14px style H to the power of plus sign end style larutan setelah dicampurkan adalah:


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 fraction numerator open square brackets H to the power of plus sign close square brackets subscript HCl middle dot V plus open square brackets H to the power of plus sign close square brackets subscript H N O subscript 3 end subscript middle dot V over denominator V subscript total end fraction end cell row blank equals cell fraction numerator 5 space M middle dot 2 space mL plus 5 space M middle dot 2 space mL over denominator 1000 space mL end fraction end cell row blank equals cell 20 over 1000 end cell row blank equals cell 0 comma 02 space M end cell end table end style 


Maka nilai pH dan pOH dapat dihitung:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes 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 open square brackets 2 middle dot 10 to the power of negative sign 2 end exponent close square brackets end cell row blank equals cell 2 minus sign log space 2 end cell row blank blank blank row 14 equals cell pH and pOH end cell row pOH equals cell 14 minus sign pH end cell row blank equals cell 14 minus sign left parenthesis 2 minus sign log space 2 right parenthesis end cell row blank equals cell 12 plus log space 2 end cell end table end style 


Jadi, pH larutan adalah 2 - log 2 dan pOH larutan adalah 12 + log 2.

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