A buffer with a pH of 4.31 contains 0.31 M of sodium benzoate and 0.24 M of benzoic acid. What is the concentration of [ H 3 O ] in the solution after the addition of 0.060 mol HCl to a final volume of 1.3 L

The hydronium ion concentration in the solution is

Explanation:

To calculate the molarity, we use the equation:

Moles hydrochloric acid solution = 0.060 mol

Volume of solution = 1 L

Putting values in above equation, we get:

The chemical reaction for aniline and HCl follows the equation:

Initial:           0.24          0.060              0.31

Final:             0.18          -                     0.37

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

We are given:

= negative logarithm of acid dissociation constant of benzoic acid = 4.2

pH = ?

Putting values in equation 1, we get:

To calculate the hydronium ion concentration in the solution, we use the equation:

pH = 3.89

Putting values in above equation, we get:

Hence, the hydronium ion concentration in the solution is

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.