16.2. Solution Concentration http://www.ck12.org
Lesson Review Questions
Reviewing Concepts
- How is a concentrated solution different from a dilute solution?
- Answer the following:
a. As the temperature of a solution increases, what happens to its molarity? Explain.
b. Why does temperature not affect the molality of a solution?Problems
- What is the mass percent of an aqueous solution prepared by dissolving 12.0 g of solute into 40.0 g of water?
- What is the volume percent of a solution prepared by adding enough water to 200. mL of acetone to make a
total volume of 1.60 L? - Calculate the molarities of the following solutions.
a. 87.2 g of Na 2 SO 4 in enough water to make 500. mL of solution
b. 61.8 g of NH 3 in enough water to make 7.00 L of solution
c. 100. mL of ethanol (C 2 H 5 OH) in 500. mL of solution (The density of ethanol is 0.789 g/mL.)- How many moles of KF are contained in 180.0 mL of a 0.250 M solution?
- Calculate how many grams of each solute would be required in order to make the given solution.
a. 3.40 L of a 0.780 M solution of iron(III) chloride, FeCl 3
b. 60.0 mL of a 4.10 M solution of calcium acetate, Ca(CH 3 COO) 2- What volume of a 0.500 M solution of NaI could be prepared with 113 g of solid NaI?
- Calculate the molarity of the solutions prepared from the following dilutions.
a. 125 mL of 2.00 M HCl is diluted to a volume of 4.00 L.
b. 1.85 mL of 6.30 M AgNO 3 is diluted to a volume of 5.00 mL. - What volume of 12 M HCl is required to prepare 6.00 L of a 0.300 M solution?
- What is the molality of the following solutions?
a. 171.9 g of Sr(NO 3 ) 2 is dissolved in 1.44 kg of water.
b. 0.883 g of K 3 PO 4 is dissolved in 40.0 g of water.- A copper wire is dipped into 250. mL of a 0.500 M solution of AgNO 3. The following single-replacement
reaction occurs. Cu(s) +2AgNO 3 (aq)→Cu(NO 3 ) 2 (aq) +2Ag(s)Assuming all of the dissolved AgNO 3
reacts, what mass of the copper wire is consumed? (Hint: solve for the moles of AgNO 3 using the molarity
equation, then apply stoichiometry to find the mass of Cu.)
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