15. What is the pH of 0.1 M HCN solution? (K, for HCN = 6.2 x 10-10) A. 1.5 B. 1.0 C. 5.1 D. 8.9 E. 7.5 16. The table below shows the pH range and color changes of three indicator. What colors would each these indiqtors be in the solution described in the question 16? Indicator pH range color at low pH color at high pH Bromophenol blue 3.0-4.6 Yellow Blue (ii) Methyl red 4.2-6.3 Red Yellow (iii)Phenolphthalein 8.3-10 Colorless Pink colorless pink (0) A. yellow B. blue C. yellow D. blue E. blue red yellow red colorless red-yellow pink colorless colorless