(E) I, II, and III
- The laboratory setup shown above can be used to prepare a
(A) gas less dense than air and soluble in water
(B) gas more dense than air and soluble in water
(C) gas soluble in water that reacts with water
(D) gas insoluble in water
(E) gas that reacts with water
- In this reaction: CaCO 3 + 2HCl → CaCl 2 + H 2 O + CO 2. If 4.0 moles of HCl
are available to the reaction with an unlimited supply of CaCO 3 , how many
moles of CO 2 can be produced at STP?
(A) 1.0
(B) 1.5
(C) 2.0
(D) 2.5
(E) 3.0
- A saturated solution of PbS at 25°C contains 5.0 × 10–14 mole/liter of Pb2+
ions. What is the Ksp value of this salt?
(A) 5.0 × 10−14
(B) 5.0 × 10−15
(C) 2.5 × 10−14
(D) 2.5 × 10−28
(E) 2.5 × 10−27
- If 0.1 mole of K 2 S was added to the solution in question 64, what would
happen to the Pb2+ concentration?
(A) It would increase.
(B) It would decrease.
(C) It would remain the same.
