Uracil is one of the Four nuleotide monomers that make up the nucleic acid RNA. uracil acid and has a molar
mass of 112g/mol. A biologist prepares a solution of the
acid by dissolving 1.24g of the compound in 1.0L of solution. The pH of the Solutionis 5.71. Calculate the
acid-dissociation Constant ka for uracil. what percent of its molecule were dissociated in the solution

What is the molecular formula of a hydrocarbon with m+ = 166? (write the formula with no subscripts, e. g. c4h10.) what is the sum of rings and double bonds in this compound?

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

What is the value of keq for the reaction expressed in scientific notation?