Answer to Question #224790 in Biochemistry for Kecious

Question

1.   What is the pH of a mixture of 5 ml of 0.1 mol/litre sodium acetate and 4 ml of 0.1 mol/litre acetic acid? (pKa of acetic acid at 25^oC = 4.76) (3) 

How is the pH changed on adding 1 ml of 0.1 mol/litre HCl followed by 3ml of 0.5 mol/litre NaOH to the mixture in question 6 above? (Show your answer by means of calculation taking consideration of transitions taking place and showing how the pH of the solutions is affected

Answer 1

All the moles of hydronium cations that were initially present in the solution are now completely consumed. The resulting solution is neutral, since it only contains water and aqueous sodium chloride.