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To prepare a buffer of pH = 8.26, amount of (NH 4 ) 2 SO 4 to be added into 500 ml. of 0.01 M NH 4 OH solution [PK­ a NH 4 + = 9.26] is

To prepare a buffer of pH = 8.26, amount of (NH4)2SO4 to be added into 500 ml. of 0.01 M NH4OH solution [PK­aNH4+ = 9.26] is 

Grade:12th pass

1 Answers

Vikas TU
14149 Points
7 years ago
From the chemical eqn.
NH3(g) + H2O(l) NH4+ + OH-
write Ka =  [NH4][OH-]/[NH3] = x^2/0.01-x = Ka
Put ka from pKa here and calcuate x.’.i.e x = [OH-]
and [H+] = Kw /[OH-] where Kw = 10^-14.
calculate then [NH4+]
similarly.
 
 
 

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