AP EAMCET Engineering 2018 Apr 23 Shift 2 Paper

First, we will calculate degree of ionization as follows:
α=√

Ka

C

=√

2.5×10−5

1

=5×10−3
The dissociation of HCl is shown below:
The concentration of H ‌+ ions is equal to α=5×10−3.
The pH of solution can be calculated as :
pH=−log[H+]
=−log(5×10−3)
=2.3