Question

Solution (a) has a hydrogen ion concentration of 2.7 x 10^-3 and solution (b) has a hydrogen ion concentration of 4.1 M. What are their pH and say if they are acids or bases.

Answer 1

Answer: a) pH = 2.56 , acidic

b) pH = 2.38, acidic

Step-by-step explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

`pH=-\log [H^+]`

a)
`[H^+]=2.7* 10^(-3)`

Putting in the values:

`pH=-\log[2.7* 10^(-3)]`

`pH=2.56`

Thus as pH is less than 7, the solution is acidic.

b)
`[H^+]=4.1* 10^(-3)`

Putting in the values:

`pH=-\log[4.1* 10^(-3)]`

`pH=2.38`

Thus as pH is less than 7, the solution is acidic.