#### Practice

Identify the solvent and solute(s) in a sample of an antiseptic that contains 65% propanol, 20% ethanol, and 15% water.

What is the molarity of the solution prepared by dissolving 33.5 g sodium oxalate (Na_{2}C_{2}O_{4}) in 250.0 ml water?

How many grams of silver nitrate (AgNO_{3}) can be obtained from an 800.0 g sample of a 65% solution?

Commercial concentrated hydrochloric acid is 36.0% by mass with a density of 1.2 g/mL. Calculate the molarity of this solution.

A student has 2.0 L of 7.0 M hydrochloric acid, HCl. She wants to prepare a 1.5 M solution. How many liters of solution can she make?

What is the concentration of the solution made by mixing 100. mL of 2.0 M and 250. mL 3.5 M solutions of potassium iodide?

How many grams of copper(II) sulfate pentahydrate (CuSO_{4}·5H_{2}O) is needed to prepare 500. mL solution of 0.480 M CuSO_{4}(aq)?

An ICU nurse is preparing for an intravenous administration of glucose (C_{6}H_{12}O_{6}). How many mL of this solution will be needed to provide 6.50 mmol of glucose if the solution is labeled as 0.350 M?

How many milliliters of 0.850 M BaCl_{2} solution are needed to obtain 9.37 g of the salt?

Calculate the concentration of each ion and their total concentration in a solution prepared by dissolving 0.2500 mol of Ca(NO_{3})_{2} in 150.0 mL of water.

Calculate the molality of a 0.500 M solution (d = 1.09 g/mL) of baking soda (NaHCO_{3}).

A solution contains 3.5 ×10^{–3} g of vitamin C in 1,625 mL of solution. What is the concentration of vitamin C in parts per million (ppm) if the density of the solution is 1.08 g/mL.

Calculate the *mass percent, mole fraction, molality, *and *molarity* of hexane (C_{6}H_{14}, *d *=0.660 g/cm^{3}) when it is mixed with heptane (C_{7}H_{12}, *d=*0.684 g/cm3) in a 35.0 : 55.0 mL ratio. Assume that the volumes are additive.

Ethylene glycol (C_{2}H_{6}O_{2}) is used in automobile antifreeze as a 40.0 mass % aqueous solution. Calculate the molarity, molality, and mole fraction of the ethylene glycol if the density of the solution is 1.05 g/cm^{3}.

A solution containing 186.5 g of KCl in 813.5 g of water has a density of 1.106 g/mL. What is the molarity of the solution?

A lab specialist has 20% and 60% stock solutions of sodium hydroxide. Suppose she is asked to prepare 100 g of 35% solution. How many grams of each solution will she need to mix?

What is the molality of the solution prepared by mixing 625.2 grams of menthol (C_{10}H_{20}O) and 3,500. grams of ethanol (C_{2}H_{5}OH).

Calculate the molality of 31.0% MgCl_{2} solution with a density of 1.27 g/mL.

How many grams of barium chloride (BaCl_{2}) are in a 0.025 molal solution if 3.50 kg of solvent was used to prepare it?

Determine the percentage concentration of 5.00 M HCl solution if its density is 1.104 g/mL.

Glycerol (CH_{3}CH(OH)CH_{2}OH) is widely used in FDA-approved wound and burn treatments. What volume of glycerol (d = 1.26 g/mL), must be added to one kilogram of water to produce a solution with 5.00 mass % glycerol?

A bottle of rum contains 40% ethanol by volume. The density of ethanol (C_{2}H_{5}OH) is 0.789 g/cm^{3}. Calculate the mass percent and molality of ethanol in the rum.

15.00 mL of propanol (CH_{3}CH_{2}CH_{2}OH) was dissolved in sufficient volume of water to prepare 100.0 mL of a solution with a density of 0.983 g/mL. Given the density of propanol is 0.803 g/mL, determine its concentration expressed as **(a) **volume percent; **(b) **mass percent; **(c) **mass/volume percent; **(d) **mole fraction; **(e) **mole percent; **(f) **molarity; **(g) **molality?

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