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Pada suhu tertentu larutan jenuh Mg(OH) 2 mempunyai pH = 8. Hasil kali kelarutan Mg(OH) 2 adalah …

Pada suhu tertentu larutan jenuh Mg(OH)2 mempunyai pH = 8. Hasil kali kelarutan Mg(OH)2 adalah …

  1. 1 x 10–10

  2. 1 x 10–12

  3. 5 x 10–15

  4. 5 x 10–16

  5. 5 x 10–19

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S. Utari

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

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Pembahasan

Diketahui: pHMg(OH) 2 = 8 Ditanya: KspMg(OH) 2 ... ? Dijawab: pH = 8 pOH = 14 - pH pOH = 14 - 8 pOH = 6

Diketahui: pH Mg(OH)2 = 8

Ditanya: Ksp Mg(OH)2  ... ?

Dijawab: 

pH = 8 

pOH = 14 - pH 

pOH = 14 - 8 

pOH = 6 begin mathsize 12px style rightwards arrow space left square bracket O H to the power of minus right square bracket space equals space 1 space x space 10 to the power of negative 6 end exponent end style

begin mathsize 12px style M g left parenthesis O H right parenthesis subscript 2 space rightwards harpoon over leftwards harpoon space space space space space space space space space M g to the power of 2 plus space end exponent space space space space space plus space space space space 2 O H to the power of minus space space space space space space space space space space space space space space space space space space space space space space space 1 half x 1 space x space 10 to the power of negative 6 end exponent space space space space space space space space space 1 space x space 10 to the power of negative 6 end exponent end style 

begin mathsize 12px style K s p space M g left parenthesis O H right parenthesis subscript 2 space equals space left square bracket M g to the power of 2 plus end exponent right square bracket left square bracket O H to the power of minus right square bracket squared K s p space M g left parenthesis O H right parenthesis subscript 2 space equals left parenthesis 1 half space x space 10 to the power of negative 6 end exponent right parenthesis left parenthesis 1 space x space 10 to the power of negative 6 end exponent right parenthesis squared K s p space M g left parenthesis O H right parenthesis subscript 2 space equals left parenthesis 5 space x space 10 to the power of negative 7 end exponent right parenthesis left parenthesis 1 space x space 10 to the power of negative 12 end exponent right parenthesis K s p space M g left parenthesis O H right parenthesis subscript 2 space equals 5 space x space 10 to the power of negative 19 end exponent end style

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