1) A useful form of the acid/base equilibrium equation is the Henderson-Hasselba

Question

1) A useful form of the acid/base equilibrium equation is the Henderson-Hasselbalch equation. Write this equation and identify each of the quantities in this equation.

2) The equation can be used to find the Ka of a buffer solution of known pH. For example, if a 0.1 M solution of propanoic acid is mixed with an equal amount of 0.1 M solution containing proponiate ion, the pH is 2.94. Change the pH into [H3O+] and then use equation 1 to solve for the Ka.

3) If you know the amounts of acid and base components in the buffer you can use the equation to find the pH. Use the text to find the Ka for benzoic acid (C6 H5COOH). Use equation 1 to find the pH of a buffer solution that is prepared with 100 mL of 0.10 M benzoic acid mixed with 100 mL of 0.10 sodium benzoate (NaC6 H5COO) solution (remember that sodium does not affect the pH so it is the benzoate that is the ion of interest).

4) In the case when the concentrations of the acid and base components of the buffer are equal, the calculations become quite simple. Instead of using Molarities in the equation, the volume of acid and base in mL can be used instead. Redo the calculation to question 3, but this time just use the volumes in mL and see that you get the same answer.

Explanation / Answer

In chemistry, the Henderson

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