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Grade 12th passPhysical Chemistry

At 25*C , the solubility product of Mg(OH)2 is (1.0 X 10 to the power -13) . At which pH, will Mg+2 ions start precipitating in the form of Mh(OH)2 from a solution of 0.001M Mg+2 ions??
  1. 1
  2. 8
  3. 9
  4. 10

Profile image of KAUSTABH PAL
9 Years agoGrade 12th pass
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1 Answer

Profile image of Umakant biswal
9 Years ago
@kaustabh 
i am giving u the correct approach to solve the question .. 
as u knws the formula to calculate the olubility constant 
ksp = c ^ 2s square 
c is given as 10 to the power -3 
then 
P (oh ) = loh ( oh ) – 
apply that equation and u will get the answer / 
option no c turns out to be the correct option . 
so, answer is 9 . 
HOPE U CAN DO IT 
AL;L THE BEST ..