Q3 What is the concentration of each ion in 1.3 x 104 M Mg(NO3)2 solution? Write the dissociation equation and show your work (ANS: 1.3 x 104 M Mg2+, 2.6 x 10^M NO32-) Q4 A 300-ml solution of 1.3-M aq. NaCl is mixed with 500 mL of 2.5-M aq. CaCl2. How many moles of chloride ion are in the combined solution? What is the molarity of chloride in the combined solution? (ANS: 2.89 mol Cl, 3.60 M CH) Q1 Between a solution of 2.0 M aq. NaNO, and 1.5 M aq. AICI (a) Which solution would have a lower freezing point? (b) Which solution would have a higher boiling point? () Which solution would have a higher osmotic pressure? Explain your answer. (ANS: All AICI) Q2 Normal saline is a solution of aqueous sodium chloride with a concentration of 0.90% (g/mL). Express this concentration in molarity; then indicate whether the osmotic pressure of each of these solutions is hypotonic, isotonic, or hypertonic compared to normal saline: (a) 1.0 MKCI (b) 0,5 M K SO (C) 4.3 M NH4CI (d) 0.15 M sugar solution (ANS: 0.154 M NaCl, (a) hypertonic, (b) hypertonic, (c) hypertonic, (d) isotonic) Q1 The concentration of lead(II) ion in water may be determined by gravimetric analysis, using this reaction: Pb2+ (aq) + S0,2- (aq) + PbSO4(s) A chemist treated an unknown lead(II) solution with a volume of 0.150 L with an excess of sodium sulfate solution. The mass of the resulting precipitate was found to be 0.00215 grams. What was the mass of lead(II) in the original sample? What was the molar concentration of the original sample? (ANS: 1.47 x 103 g Pb2+, 4.37 x 105 M Pb2+)