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Larutan Ca(OH) 2 yang terbentuk dari 0,74 gram Ca(OH) 2 (Mr = 74) dalam 2 liter air mempunyai nilai pH sebesar….

Larutan Ca(OH)2  yang terbentuk dari 0,74 gram Ca(OH)2 (Mr = 74) dalam 2 liter air mempunyai nilai pH sebesar….

  1. 2 – log 2

  2. 2 – log 1

  3. A.    12 + log 1

  4. 12 + log 4

  5. 13 – log 2

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Pembahasan

Diketahui : massa Ca(OH) 2 = 0,74 gram Mr Ca(OH) 2 = 74 gram/mol Volume larutan = 2 liter = 2000 mL

Diketahui :     massa Ca(OH)2 = 0,74 gram

                      Mr Ca(OH)2 = 74 gram/mol

                      Volume larutan = 2 liter = 2000 mL

table attributes columnalign right center left columnspacing 0px end attributes row cell straight M space Ca left parenthesis OH right parenthesis subscript 2 end cell equals cell fraction numerator m a s s a space C a left parenthesis O H right parenthesis subscript 2 over denominator M r space C a left parenthesis O H right parenthesis subscript 2 end fraction cross times 1000 over straight v end cell row blank equals cell fraction numerator 0 comma 74 over denominator 74 end fraction cross times 1000 over 2000 end cell row blank equals cell 5 cross times 10 to the power of negative 3 end exponent space straight M end cell end table

 

C a open parentheses O H close parentheses subscript 2 space rightwards harpoon over leftwards harpoon space C a to the power of 2 plus end exponent space plus space 2 O H to the power of minus open square brackets O H to the power of minus close square brackets equals M space cross times space v a l e n s i space b a s a open square brackets O H to the power of minus close square brackets equals 5 space cross times space 10 to the power of negative 3 end exponent space M space cross times space 2 space equals space 1 cross times 10 to the power of negative 2 end exponent

table attributes columnalign right center left columnspacing 0px end attributes row cell p O H end cell equals cell negative log space open square brackets O H to the power of minus close square brackets end cell row blank equals cell negative log space 1 cross times 10 to the power of negative 2 end exponent end cell row blank equals cell 2 minus log space 1 end cell row cell p H space space space end cell equals cell 14 minus p O H end cell row blank equals cell 14 minus left parenthesis 2 minus log space 1 right parenthesis end cell row blank equals cell 12 plus log space 1 end cell end table

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