How to calculate the ratio of sodium carbonate and sodium bicarbonate in 'x' Molar sodium carbonate-sodium biocarbonate buffer?
For instance, I wish to prepare 0.25M carbonate-bicarbonate buffer of pH9.0. How do I determine the amount of sodium carbonate and sodium bicarbonate to prepare the buffer?
For instance, I wish to prepare 0.25M carbonate-bicarbonate buffer of pH9.0. How do I determine the amount of sodium carbonate and sodium bicarbonate to prepare the buffer?
1 Answer
Use 20 g sodium hydrogen carbonate and 1.1 g sodium carbonate.
Explanation:
The equation for the buffer equilibrium is
Let's rewrite this equation as
The Henderson-Hasselbalch equation is
(a) Calculate the buffer ratio
Also
So, you dissolve
(b) Calculate the masses of