Question 3 (1 point) A solution is 0.049 Min formic acid, HCOOH, and has a pH of 4.37. What is the concentration of formate ion? (K, of formic acid = 1.8*10-4) Report your answer to 3 decimal places Your Answer: Your Answer Question 4 (1 point) How does a buffer resist change in pH upon addition of a strong acid? The strong acid reacts with the weak base in the buffer to form a weak acid, which produces few H+ ions in solution and therefore only a little change in pH. The strong acid reacts with the strong base in the buffer to form a salt which produces few Hions in solution and therefore only a little change in pH. The strong acid reacts with the weak acid in the buffer to form a weak base, which produces few Hions in solution and therefore only a little change in pH. Question 5 (1 point) For the acid/base titration of HCN and KOH, choose a suitable indicator from the list below. Beside each indicator the pH range of colour change at its endpoint is provided bromocresol green (3.8 - 5.4) thymol blue (8.2 - 9.6) brilliant yellow (6.6 - 7:8)