Question

1. Calculate the concentration of silver cations in 0,05 M solution of potassium
dicyanoargentate, which also contains 0.01 mol/l of KCN. The general stability constant
of complex ion
[Ag(CN):)-is 1-10-21​

Answer 1

Explanation:

wer

K

4

[Fe(CN)

6

]→4K

⊕

+[Fe(CN

6

]

4−

Initial 1 0 0

At eq. 1−α 4α α

Total moles at equilibrium =1−α+4α+α=1+4α

α=50%=0.5 (given)

∴i=

1

1+4α

=1+4×0.5=3

Using the formula, π=iMRT

=3×0.1×0.082×300=7.38 atm.