The pH of a saturated solution of calcium hydroxide is 1240 What is K sp for

# The ph of a saturated solution of calcium hydroxide

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13. The pH of a saturated solution of calcium hydroxide is 12.40. What is Kspfor this salt? (A) 6.3 x 10¯38(B) 1.58 x 10¯25(C) 7.9 x 10¯6(D) 1.58 x 10¯5 14. The mass of a nitrogen gas molecule is 14 times that of a hydrogen molecule. What is the hydrogen molecule's velocity, relative to that of the nitrogen molecule (VN2), if both are at the same temperature? 15. The Kspof PbBr2is 6.3 x 10¯6. If 50 mL of 0.020 M Pb(NO3)2are mixed with 50 mL of 0.010 M CaBr2, which of the following is true? 16. According to the phase diagram to the right, if the pressure is increased at constant temperature, from point A, what change will
occur? 17. How many of the following salts will be more soluble in acid solution than in pure water? CdCO3, Mn(OH)2, PbS, PbCl2 (A) 1 (B) 2 (C) 3 (D) 4 18. A 50.0 mL sample of nitrogen gas is collected over water at 25 °C and 720 torr. What is the volume in mL of the dry gas at STP? (The vapor pressure of water at 25 °C is 23.8 torr.) 19. To which of the following would addition of an equal volume of 0.50 M NaOH lead to a solution having a lower pH? 20. Consider the solvent effect on acid dissociation. Would you expect HCl to be weak or strong in the two solvents, water and benzene (C6H6)? 21. The equilibrium constant for the equation below is very small; that is, K << 1. HX (aq) + Y¯(aq) <===> X¯ (aq) + HY (aq)
Which statement is true? (A) The reaction goes nearly to completion (B) HY is a weaker acid than HX (C) X¯ is a better proton acceptor than Y¯ (D) Y¯ is a stronger base than X¯ 22. Consider the reaction 3A (g) + 2B (g) <===> C (g). Initially, only A and C are present, each at a concentration of 0.20 M. At equillibrium, the concentration of B is 0.10 M. What is the value of the equilibrium constant, Kc, for the reaction? 23. Consider the system NH 4 Cl (s) <===> NH 3 (g) + HCl (g) If the concentration of ammonia gas is tripled, the value of the equilibrium constant will (A) triple (B) increase, buy by more than a factor of three (C) decrease to one-third its value (D) remain the same

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