Question

. Answer the following in one sentence :
i. Why cations are Lewis acids?
ii. Why is KCl solution neutral to
litmus?
iii. How are basic buffer solutions
prepared?
iv. Dissociation constant of acetic
acid is 1.8 x 10-5. Calculate percent
dissociation of acetic acid in 0.01 M
solution.​

Answer 1

Answer:

1 ) - According to lewis concept , proton gainers are acids , so cations being having a positive net charge , is considered to be lewis acid.

2) - KCl is formed by reaction of KOH ( potassium hydroxide ) and HCl ( Hydrochloric acid ) , these two compounds are very strong base and very strong acid respectively , thus the salt formed i.e. KCl is neutral having no change in colour on litmus.

3 ) - Basic buffer solutions are prepared by mixing a weak base , its salt , an acid solution and water .

4 ) - For weak acid,

α=(CKa)21

Here, 

α is degree of dissociation 

Ka is dissociation constant which is given as 10−5

C is concentration of acid which is given as 0.1 molL−1

On substituion of above values in the formula

α=(0.110−5)21

α=(10−4)21

α=102−4

α=10−2

α=0.01

So the degree of dissociation of acetic acid is 0.01 .

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