Question

Write three significance of Henderson Hasselbalch equation?

Answer 1

Henderson's equation for acid buffer solution:
$pH=p{K}_a+log\frac{\left[salt\right]}{\left[acid\right]}$
Henderson's equation for basic buffer solution:
$pH=p{K}_a-log\frac{\left[salt\right]}{\left[base\right]}$
The significance of Henderson equation:
1) Henderson's equation can be used to calculate the pH of buffer solution.
2) Henderson's equation can be used to calculate the ratio $\frac{\left[salt\right]}{\left[acid\right]}$ in which acid and salt must be mixed to get a buffer solution of desired pH value.
3) When pH and total concentration of buffer is given, the concentration of acid and salt ( or base and salt) can be calculated.