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Suatu basa lemah MOH mempunyai pH = 11 + log 2, (Kb MOH = 2×10−5). Konsentrasi basa tersebut adalah ...

Pertanyaan

Suatu basa lemah MOH mempunyai begin mathsize 14px style pH space equals space 11 space plus space log space 2 end stylebegin mathsize 14px style left parenthesis Kb space MOH space equals space 2 cross times 10 to the power of negative sign 5 end exponent right parenthesis end style. Konsentrasi basa tersebut adalah ...

  1. ... space 

  2. ... undefined 

S. Lubis

Master Teacher

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Jawaban

konsentrasi basa tersebut adalah 0,2 M.

Pembahasan

  • Mencari begin mathsize 14px style pOH end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pOH space end cell equals cell space 14 space minus sign space pH end cell row blank equals cell space 14 space minus sign space left parenthesis 11 space plus space log space 2 right parenthesis end cell row blank equals cell space 3 space minus sign space log space 2 end cell end table end style
 

  • Mencari begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style

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 space log space open square brackets O H to the power of minus sign close square brackets end cell row cell 3 space minus sign space log space 2 space end cell equals cell space minus sign space log space open square brackets O H to the power of minus sign close square brackets end cell row cell open square brackets O H to the power of minus sign close square brackets space end cell equals cell space 2 cross times 10 to the power of negative sign 3 end exponent end cell end table end style 
 

  • Mencari begin mathsize 14px style open square brackets MOH close square brackets 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 space end cell equals cell space square root of Kb cross times M end root end cell row cell 2 cross times 10 to the power of negative sign 3 end exponent space end cell equals cell space square root of 2 cross times 10 to the power of negative sign 5 end exponent cross times M end root end cell row cell left parenthesis 2 cross times 10 to the power of negative sign 3 end exponent right parenthesis squared space end cell equals cell space 2 cross times 10 to the power of negative sign 5 end exponent cross times M end cell row cell 4 cross times 10 to the power of negative sign 6 end exponent space end cell equals cell space 2 cross times 10 to the power of negative sign 5 end exponent cross times M end cell row cell M space end cell equals cell space 2 cross times 10 to the power of negative sign 1 end exponent end cell row cell M space end cell equals cell space 0 comma 2 end cell end table end style
  

Jadi, konsentrasi basa tersebut adalah 0,2 M.

2rb+

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