Fluoride ion is poisonous in relatively low amounts: 0.2 g of f- per 70 kg of body weight can cause death. nevertheless, in order to prevent tooth decay, f- ions are added to drinking water at a concentration of 1 mg of f- ion per l of water. how many liters of fluoridated drinking water would a 70-kg person have to consume in one day to reach this toxic level? how many kilograms of sodium fluoride would be needed to treat a 8.5 x107-gal reservoir?

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

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

Calculate the mass of carbon in 97.0 g of sucrose c12h22o11