i need help for the three questions

A 1 liter solution contains 0.258M hypochlorous acid and 0.344M sodium hypochlorite. Addition of 0.284 moles of potassium hydroxide will: (Assume that the volume does not change upon the addition of potassium hydroxide.) (Select all that apply.) Exceed the buffer capacity Raise the pH slightly Lower the pH slightly Raise the pH by several units Lower the pH by several units Not change the pH A 1 liter solution contains 0.584M hypochlorous acid and 0.438M sodium hypochlorite. Addition of 0.219 moles of hydrobromic acid will: (Assume that the volume does not change upon the addition of hydrobromic acid.) (Select all that apply.) Raise the pH slightly Exceed the buffer capacity Lower the pH slightly Not change the pH Lower the pH by several units Raise the pH by several units A 1 liter solution contains 0.463M hydrofluoric acid and 0.347M potassium fluoride. Addition of 0.382 moles of nitric acid will: (Assume that the volume does not change upon the addition of nitric acid.) (Select all that apply.) Exceed the buffer capacity Not change the pH Raise the pH slightly Lower the pH slightly Raise the pH by several units Lower the pH by several units