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Grade: 12 
        the ph at which a 0.01 M Al+3 solution is 99.99 % precipitated is (Al(OH)3Ksp : 1 .99*10^-9)Answer is 10
2 years ago

Answers : (1)

Bhavya Aggarwal
15 Points 
							
Al(OH)3 === Al3+ + 3OH-
        s                0          0
       0                s          3s
 
  s.(3s)3 = 10-18
  27s4   = 10-18
   s =~  10-4/7
Now, OH- = 3s
OH- = 3x10-4/7
pOH = -log 3x10-4/7
pOH = 3.8
pH = 14-pOH
pH = 10.3 
5 months ago
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