One liter of a solution contains 0.120 moles of benzoic acid c6h5cooh (ka = 6.5 x 10-5) and 0.105 moles of sodium benzoate c6h5coona. a) calculate the ph of this solution. b) calculate the ph of the resulting solution after adding 100 ml of 1.20 m solution of naoh to the starting solution; c) calculate the ph of the resulting solution after adding 100 ml of 0.100 m hcl solution to the starting solution.

Part b: study of equilibrium on solubility: mg(oh)2(s) ⇌ mg2+(aq) + 2 oh–(aq) cloudy clear (pink) 7. a. b. 8. a. b. 9. 10. 11. 12. when adding concentrated hydrochloric acid, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 7a. you should indicate which ion was added to or removed from the equilibrium mixture. when adding edta, how did the appearance of the equilibrium mixture change? the change in appearance indicated a shift in the point of equilibrium. in which direction did the equilibrium shift? (l) left (r) right explain your answer to question 8a. you should indicate which ion was added to or removed from the equilibrium mixture. upon heating in which direction is the equilibrium shifting? upon cooling in which direction is the equilibrium shifting? is the forward reaction a. endothermic explain your answers to questions 9, 10, and 11. (l) left (r) right (l) left (r) right b. exothermic

Classify this reaction: 2al+n2-> aln.

What does the symbol (–hfus) indicate in a phase change?