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Pertanyaan

Kelarutan begin mathsize 14px style Pb open parentheses O H close parentheses subscript 2 end style di dalam larutan yang mempunyai pH = 12 adalah ....
begin mathsize 14px style open parentheses K subscript sp space Pb open parentheses O H close parentheses subscript 2 equals 1 comma 2 cross times 10 to the power of negative sign 15 end exponent close parentheses end style

  1. begin mathsize 14px style 6 comma 0 cross times 10 to the power of negative sign 13 end exponent space mol forward slash L end style

  2. begin mathsize 14px style 1 comma 2 cross times 10 to the power of negative sign 13 end exponent space mol forward slash L end style

  3. begin mathsize 14px style 1 comma 0 cross times 10 to the power of negative sign 13 end exponent space mol forward slash L end style

  4. begin mathsize 14px style 6 comma 0 cross times 10 to the power of negative sign 11 end exponent space mol forward slash L end style

  5. begin mathsize 14px style 1 comma 2 cross times 10 to the power of negative sign 11 end exponent space mol forward slash L end style

Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah E.

Pembahasan

Berikut langkah penyelesaiannya:

  1. 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 pH equals cell 14 minus sign pOH end cell row 12 equals cell 14 minus sign pOH end cell row pOH equals 2 row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row 2 equals cell negative sign 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 end cell equals cell 10 to the power of negative sign 2 end exponent end cell end table end style 
     
  2. Menentukan kelarutan begin mathsize 14px style Pb open parentheses O H close parentheses subscript 2 end style

    begin mathsize 14px style Pb open parentheses O H close parentheses subscript 2 equilibrium Pb to the power of 2 plus sign and 2 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 K subscript sp end cell equals cell open square brackets Pb 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 cell 1 comma 2 cross times 10 to the power of negative sign 15 end exponent end cell equals cell s cross times left parenthesis 10 to the power of negative sign 2 end exponent right parenthesis squared end cell row s equals cell 1 comma 2 cross times 10 to the power of negative sign 11 end exponent space mol forward slash L end cell end table end style

Jadi, jawaban yang benar adalah E.

33

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