Question

swer H of a saturated solution of Ca (OH)2 i 12.37. What is the Kap 22. of Ca (OH)2 Answer: 23. Which ot the following processes are accompan entropy nied by an increase in Answer 24. For a chemical reaction, DH +21.16 kJ mo1-1. The value of Dso for the same reaction was +74.50 J mol-1 K-1. 1, since the physical states do not change, the value of DH and Ds do not change with temperature over the range of interest, what should be the value of DG 'T at +550.0 c Answer: is 23.33 kJ/mol. Calculate the molar entropy of vaporization (DSvap) for ammonia. 25. Ammonia (NH3) has a normal boiling point of -33.33 c, and its Diyap Answer:

Answer 1

pH = 12.37 POH = 14 - pH Therefore POH = 14 - 12.37 = 1.63 and POH = -log [OH^-] = > [OH^-] = 10^-POH = 10^-1.63 = 0.0234 n Ca(OH)_2 rightarrow^K_sp Ca^+2 (aq) + 2 OH^- (aq) k_SP = [Ca^+2] [OH^-]^2 (1) Here [OH^-] = 2s = 0.0234 = > s = 0.0127 = > [Ca^+2] = s = 0.0127 m plugging value is eq (1) K_sp = (0.0127) (0.0234)^2 K_Sp = 6.9 times 10^-6