Question

The pH can be kept constant with the help of?

(a) Saturated solution

(b) Unsaturated solution

(c) Buffer solution

(d) Non-Saturated solution

I had been asked this question during an interview.

Asked question is from Buffers in division Introduction to Fermentation Processes & Media for Industrial Fermentation of Bioprocess Engineering

Answer 1

Right answer is (c) Buffer solution

To explain: A buffer is a special solution that stops massive changes in pH levels. Every buffer that is made has a certain buffer capacity, and buffer range. The buffer capacity is the amount of acid or base that can be added before the pH begins to change significantly. It can be also defined as the quantity of strong acid or base that must be added to change the pH of one liter of solution by one pH unit. The buffer range is the pH range where a buffer effectively neutralizes added acids and bases, while maintaining a relatively constant pH.