When 20 ml of 0.1 `MNH_(4)OH` are added to 20 ml of `MNH_(4)Cl` solution, the pH of the buffer formed is 8.2. What is the `pK_(b)` of `NH_(4)OH`?

20 mL of 0.1 M H_2SO_4 solution is added to 30 mL of 0.2 M NH_4OH solution. The pH of the resultant mixture is : [ pK_b of NH_4OH =4.7]

When 1.0 ml of dil H_2SO_4 is added to 100 ml of a buffer solution of pH :

20mL of 0.1M(H_(2)SO_(4)) solution is added to 30mL of 0.2M(NH_(4)OH) soulution. The ._(p)H of the resultant mixture is : [(p)k_(b) " of " NH_(4)OH=4.7] .

50 ml of 0.2 M NH_(4)OH and 50 ml of 0.2 M HCl solutions are Mixed. pH of the resulting solution is (Given Kb of NH_(4)OH=1 times 10^(-5) )

20mL of 0.1M(H_(2)SO_(4)) solution is added to 30mL of 0.2M(NH_(4)OH) soulution. The ._(p)H of the resultant mixture is : [._(p)k_(b) " of " NH_(4)OH=4.7] .

10 ml of M/10 NH_(4)OH is mixed with 4ml of M/10H_(2)SO_(4) solution. The pH of the resulting solution is (pK_(b)NH_(4)OH=4.76), (log2=0.3) .

50 ml of 0.1 M NH_(4)OH, 25 ml of 2M NH_(4)Cl were used to make a buffer. What is the pH if pK_(a) is 4.8?

Amount of (NH_(4))_(2)SO_(4) which must be added to 50mL of 0.2 M NH_(4)OH solution to yield a solution of pH 9.26 is ( pK_(b) of NH_(4)OH=4.74 )