Buffer Solution pH Calculation After Addition of HBr

What is the pH of a buffer solution after the addition of HBr?

A 1 L buffer solution contains 0.149 M HCIO and 0.150 M NaCIO. What is the pH after addition of 1.50 mg of HBr? (assume no volume change upon addition of HBr). HCIO Ka = 2.9 * 10 ⁻⁸.

Answer:

The pH of the buffer solution after the addition of HBr is calculated to be 7.44.

Buffer solutions play a crucial role in maintaining a stable pH in various chemical systems. When an acid like HBr is introduced to a buffer solution, it reacts with the components of the buffer and alters the pH. In this case, the addition of 1.50 mg of HBr to a buffer solution with known concentrations of HCIO and NaCIO requires calculating the new pH.

After determining the amount of HBr added and recalculating the concentrations of HCIO and NaCIO in the solution, the Henderson-Hasselbalch equation is used to find the pH. By incorporating the pKa value and the ratio of base to acid components in the buffer, the pH value of 7.44 is obtained.

This calculation showcases the importance of buffer solutions in resisting pH changes and highlights the application of equilibrium principles in chemical systems. Understanding the behavior of buffer solutions can be beneficial in various laboratory and industrial settings where maintaining stable pH levels is essential.