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Diketahui larutan NaOH 0,001 M, maka pH larutan tersebut adalah ....

Diketahui larutan NaOH 0,001 M, maka pH larutan tersebut adalah ....undefined 

  1. 3undefined 

  2. 3 - log 2undefined 

  3. 11undefined 

  4. 11 - log 2undefined 

  5. 11 + log 2undefined 

Jawaban:

Larutan NaOH merupakan basa kuat yang terionisasi sempurna.
Tahap 1, cari begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style
begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets double bond M subscript b cross times b end style 
b = Valensi basa/jumlah ion begin mathsize 14px style O H to the power of minus sign end style, nilai b dalam NaOH = 1

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 0 comma 001 cross times 1 end cell row blank equals cell 0 comma 001 end cell row blank equals cell 10 to the power of negative sign 3 end exponent space M end cell end table end style    

Tahap 2, cari pH NaOH

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pOH space end cell equals cell space minus sign log open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell space minus sign log left parenthesis 0 comma 001 right parenthesis end cell row blank equals cell space 3 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pH space end cell equals cell space 14 space minus sign space pOH end cell row blank equals cell space 14 space minus sign space 3 end cell row blank equals cell space 11 end cell end table end style 

Jadi, jawaban yang benar adalah  C.

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