Jika Ksp ​Mg(OH)2​ pada 25∘C adalah 4×10−12, hitunglah pH larutan jenuh Mg(OH)2​.

Pertanyaan

Jika begin mathsize 14px style K subscript sp space end subscript Mg open parentheses O H close parentheses subscript 2 end style pada begin mathsize 14px style 25 degree straight C end style adalah begin mathsize 14px style 4 cross times 10 to the power of negative 12 end exponent end style, hitunglah pH larutan jenuh begin mathsize 14px style Mg open parentheses O H close parentheses subscript 2 end style

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Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

Jawaban

pH larutan jenuh begin mathsize 14px style Mg begin bold style open parentheses O H close parentheses end style subscript bold 2 end style adalah 10+log 2.

Pembahasan

Pembahasan

Langkah 1: menghitung nilai kelarutan (s)

begin mathsize 14px style table row cell Mg open parentheses O H close parentheses subscript 2 left parenthesis italic a italic q right parenthesis end cell rightwards harpoon over leftwards harpoon cell Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis end cell plus cell 2 O H to the power of minus sign left parenthesis italic a italic q right parenthesis end cell row s blank s blank cell 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 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 4 x 10 to the power of negative sign 12 end exponent end cell equals cell s middle dot open parentheses 2 s close parentheses squared end cell row cell 4 x 10 to the power of negative sign 12 end exponent end cell equals cell 4 s cubed end cell row s equals cell 10 to the power of negative sign 4 end exponent end cell end table end style

Langkah 2: menghitung nilai pH

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals 2 s open square brackets O H to the power of minus sign close square brackets equals 2 cross times 10 to the power of negative sign 4 end exponent end style

begin mathsize 14px style pOH equals minus sign log space open square brackets O H to the power of minus sign close square brackets pOH equals minus sign log space 2 cross times 10 to the power of negative sign 4 end exponent pOH equals 4 minus sign log space 2 end style

begin mathsize 14px style pH equals 14 minus sign pOH pH equals 14 minus sign open parentheses 4 minus sign log space 2 close parentheses pH equals 10 plus log space 2 end style

Jadi, pH larutan jenuh begin mathsize 14px style Mg begin bold style open parentheses O H close parentheses end style subscript bold 2 end style adalah 10+log 2.

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Muhammad Abdi Firmansyah

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Pertanyaan serupa

Di dalam suatu larutan jenuh AgI terdapat ion Ag+ = 3×10−9 M. Jika diketahui Ksp​ AgI = 1,5×10−16  tentukan ion I− dalam larutan tersebut!

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