Question

The new concentrations of nh3 and nh4 can be calculated and substituted into the henderson-hasselbalch equation to find the new ph. The change in ph is the difference between the initial and final ph. What is the purpose of calculating the new concentrations of nh3 and nh4 and substituting them into the henderson-hasselbalch equation?

1) To determine the equilibrium constant
2) To calculate the pKa value
3) To find the pH of the solution
4) To measure the concentration of the buffer solution

Answer 1

Calculating the new concentrations of NH3 and NH4+ for substitution into the Henderson-Hasselbalch equation is essential for determining the new pH of a buffer solution after adding an acid or base.

Step-by-step explanation:

The purpose of calculating the new concentrations of NH3 (ammonia) and NH4+ (ammonium) and substituting them into the Henderson-Hasselbalch equation is to find the pH of the solution. The equation provides a direct way to calculate the pH of a buffer solution by using the ratio of the concentrations of the conjugate base (in this case, ammonia) to the conjugate acid (ammonium). In a buffer solution, the addition of a strong acid or base results in the conversion of some of the base to acid or acid to base, which can be quantified by recalculating their concentrations and then using the Henderson-Hasselbalch equation to determine the new pH.