Question

hydrogen ion concentration of an acid is 1 * 10-2 mol/l. what is its pH?

Answer 1

-log 10 [1*10-2] = -[log10 1+log10 10-2] = -[0-2 log10 10]
=-[0-2] = 2 
ph < 7 it is a acidic solution.

[log 10 1=0]
[log 10 10=1]

Answer 2

Answer:

The pH value of hydrogen ion concentration of an acid is 2.

Explanation:

We have given in question:  

Concentration of an acid $=1 \times 10^{-2} \text { mole/ } L$

We can consider the acid as the monobasic acid therefore:

The concentration of acid = concentration of H+ ions

The concentration of H+ ions determines the pH of solution as the relation between the ‘concentration of H+’ and pH can be written as:

$\mathrm{pH}=-\log [\mathrm{H}+]$

Plug the given value of concentration of H+

$\mathrm{pH}=-\log \left[1 \times 10^{-2}\right]$

$\bold{\mathrm{pH}=2}$