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Jika K sp ​ L ( OH ) 2 ​ pada T ∘ C = 3 , 2 × 1 0 − 11 , larutan jenuh L ( OH ) 2 ​ dalam air mempunyai pH sebesar ....

Jika pada , larutan jenuh dalam air mempunyai pH sebesar ....

  1. 10 + 2 log 2

  2. 10 + log 2

  3. 10

  4. 4 - log 2

  5. 4 - 2 log 2

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Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

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Pembahasan

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Menentukan nilai s Menentukan konsentrasi ion Menentukan pOH Menentukan nilai pH Jadi, jawaban yang benar adalah A.

  • Menentukan nilai s

  begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell L open parentheses O H close parentheses subscript 2 end cell rightwards arrow cell L to the power of 2 plus sign space plus space 2 O H to the power of minus sign end cell row blank blank cell space space space space s space space space space space space space space space space space space s space space space space space space space space space space space 2 s end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp end cell equals cell open square brackets L to the power of 2 plus sign close square brackets open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell space s space cross times space left parenthesis 2 s right parenthesis squared space end cell row blank equals cell space 4 s cubed end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell s space end cell equals cell space cube root of fraction numerator 3 comma 2 cross times 10 to the power of negative sign 11 end exponent over denominator 4 end fraction end root end cell row blank equals cell space cube root of 8 cross times 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell space 2 space cross times space 10 to the power of negative sign 4 end exponent end cell end table end style 

  • Menentukan konsentrasi ion begin mathsize 14px style O H to the power of minus sign 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 2 s end cell row blank equals cell space 2 space cross times space 2 cross times 10 to the power of negative sign 4 end exponent end cell row blank equals cell space 4 space x space 10 to the power of negative sign 4 end exponent space end cell end table end style

  • Menentukan pOH

 begin mathsize 14px style pOH space equals space minus sign log space open square brackets O H to the power of minus sign close square brackets equals space minus sign log space 4 cross times 10 to the power of negative sign 4 end exponent equals space 4 space minus sign space log space 4 end style 

  • Menentukan nilai pH

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 left parenthesis 4 minus sign log space 4 right parenthesis end cell row blank equals cell space 10 space plus space log space 4 end cell row blank equals cell space 10 space plus space log space 2 squared end cell row blank equals cell space 10 space plus space 2 space log space 2 end cell end table end style 

undefinedJadi, jawaban yang benar adalah A. 

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Pada suhu tertentu hasil kali kelarutan Pb ( OH ) 2 ​ = 5 ⋅ 1 0 − 10 .Tentukanlah : pH saat larutan tepat jenuh (saat akan terbentuk endapan).

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