Question

Calculate pH of an aqueous solution having H₃0+ concentration equal to 7.9x10⁻¹¹. M. Which nature, acidic, basic or neutral will be possessed by this aqueous solution. Solve the given problem.

Answer 1

 [H3O + ] = 7.9 x 10^-11 M
The pH can be calculated using the formula:
pH = -log10[H3O+]
putting the value of hydronium ion concentration in above equation,we get:
pH = -log10[7.9 x 10^-11]
pH = 11 - log10[7.9]
using the log table, we get:
pH = 11-0.8976 = 10.10

here we get ,the pH of the solution is greater than 7, thus the solution is $\bf{basic}$ in nature.

Answer 2

Answer:

• pH = 10.1

• Basic nature

Explanation:

Hydronium ion concentration roughly corresponds with hydrogen ion concentration.

Hence, pH is calculated by -

pH = -log[H3O+]

pH = -log(7.9×10^-11)

pH = -log(7.9) - (log10^-11)

pH = -0.8976 + 11

pH = 10.1024

As pH of the solution is more than 7, given solution is of basic (alkaline) nature.