1)Calculate the pH of a solution prepared by mixing 5.0 mL of 0.10 M NH3 with 10.0 mL of 0.020 M HCl.

2) Calculate the pH of the solution obtained by adding 20 mL of 0.10 M HOAc to 20 mL of 0.10 M NaOH

3)A buffer solution is prepared by adding 20 mL of 0.10 M sodium hydroxide solution to 50 mL of 0.10 M acetic acid solution. What is the pH of the buffer?.