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Pertanyaan

begin mathsize 14px style K subscript sp space Mg open parentheses O H close parentheses subscript 2 equals 2 cross times 10 to the power of negative sign 11 end exponent end style, maka kelarutan begin mathsize 14px style Mg open parentheses O H close parentheses subscript 2 end style pada larutan yang mempunyai pH = 11 adalah ....begin mathsize 14px style space end style 

S. Hidayati

Master Teacher

Mahasiswa/Alumni Universitas Indonesia

Jawaban terverifikasi

Jawaban

kelarutan begin mathsize 14px style bottom enclose Mg bold open parentheses O H bold close parentheses subscript bold 2 end enclose end style pada larutan yang mempunyai pH = 11 sebesar begin mathsize 14px style bottom enclose bold 2 bold cross times bold 10 to the power of bold minus sign bold 5 end exponent end enclose end style.

Pembahasan

Diketahui larutan memiliki pH = 11, berarti:

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

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes 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 3 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 3 end exponent end cell end table end style 


Kelarutan begin mathsize 14px style Mg open parentheses O H close parentheses subscript 2 end style pada larutan yang mempunyai pH = 11:

Error converting from MathML to accessible text. 

Nilai 2s jauh lebih kecil dibandingkan begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style larutan sehingga dapat diabaikan.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript sp space Mg open parentheses O H close parentheses subscript 2 end cell equals cell open square brackets Mg to the power of 2 plus sign close square brackets open square brackets O H to the power of minus sign close square brackets squared end cell row cell 2 cross times 10 to the power of negative sign 11 end exponent end cell equals cell open parentheses s close parentheses left parenthesis 2 s plus 10 to the power of negative sign 3 end exponent right parenthesis squared end cell row cell 2 cross times 10 to the power of negative sign 11 end exponent end cell equals cell open parentheses s close parentheses left parenthesis 10 to the power of negative sign 3 end exponent right parenthesis squared end cell row s equals cell fraction numerator 2 cross times 10 to the power of negative sign 11 end exponent over denominator 10 to the power of negative sign 6 end exponent end fraction end cell row s equals cell 2 cross times 10 to the power of negative sign 5 end exponent end cell end table end style 


Jadi, kelarutan begin mathsize 14px style bottom enclose Mg bold open parentheses O H bold close parentheses subscript bold 2 end enclose end style pada larutan yang mempunyai pH = 11 sebesar begin mathsize 14px style bottom enclose bold 2 bold cross times bold 10 to the power of bold minus sign bold 5 end exponent end enclose end style.

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