a. Sketch the graph of pH that would be obtained when 10.0 cm³ of 0.200 mol dm^–3 HCl is titrated against 0.200 mol dm^–3 aqueous ammonia.

b. Explain why methyl orange is a suitable indicator for this titration but phenolphthalein is not.

c. Sketch the graph that would be obtained if 25.0 cm³ of 0.200 mol dm^–3 sodium hydroxide is titrated against 0.100 mol dm^–3 ethanoic acid solution.

d. Explain why phenolphthalein is a suitable indicator for this titration but methyl orange is not.

e. Bromocresol green and bromothymol blue are indicators. Their pKa values are: bromocresol green = 4.7 and bromothymol blue = 7.0. Would either of these indicators be suitable for the titration in part a or the titration in part c? Explain your answer.