Calculate the number of moles of N H 4 C l that should be added to one litre of 1.0 M N H 4 O H to prepare…

Calculate the number of moles of N H 4 C l that should be added to one litre of 1.0 M N H 4 O H to prepare buffer solution with pH = 9 K b =2 × 10 5 , take log 2 = 0 .3
  1. 3.4
  2. 2.6
  3. 1.5
  4. 2

Solution

It is basic buffer
pOH = pK b + log [salt] [weak base]
pOH = 14 9 = 5
5 = 4 .7 log x 1
0 .3 = log x x = 2 ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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