Mixtures and Solutions (Chemistry Unit Review)

A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reaction is given below. HCl + NaOH mc011-1.jpg NaCl + H2O What was the original concentration of the HCl solution?

0.040 M

The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution?

0.151 M

A chemistry teacher adds 50.0 mL of 1.50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution?

0.300 M

A stock solution is made by dissolving 66.05 g of (NH4)2SO4 in enough water to make 250 mL of solution. A 10.0 mL sample of this solution is then diluted to 50.0 mL. Given that the molar mass of (NH4)2SO4 is 132.1 g/mol, what is the concentration of the new solution?

0.400 M

Which solution is the most concentrated?

2.0 mL of 10.5 M H2O2, where H2O2 has a molar mass of 34 g/mol

In a group assignment, students are required to fill 10 beakers with 0.720 M CaCl2. If the molar mass of CaCl2 is 110.98 g/mol and each beaker must have 250. mL of solution, what mass of CaCl2 would be used?

200 g

How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?

240 g

A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume?

250 mL

Given that the molar mass of NaNO3 is 85.00 g/mol, what mass of NaNO3 is needed to make 4.50 L of a 1.50 M NaNO3 solution?

574 g

A student prepares 150.0 mL of 1.40 M HCl using 35.0 mL of a stock solution. What is the concentration of the stock solution?

6.00 M

In a school's laboratory, students require 50.0 mL of 2.50 M H2SO4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 M. What volume of the stock solution would they use to make the required solution?

6.94 mL

Which statement best describes the process of making a solution by diluting a stock solution?

Add more solvent to decrease the concentration.

Which statement accurately describes part of the dissolving process of a polar solute in water?

Water molecules surround solute molecules.

Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution?

[K2CrO4]

Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture?

a suspension

Which is an example of a nonaqueous solution?

gasoline

Which of these factors will cause a solid solute to dissolve faster?

increasing the surface area of solute

A solution contains 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether. Which is the solvent in this solution?

methanol

Which best defines concentration?

ratio that describes the amount of solute divided by the amount of solvent or solution

Josh prepares a solution by mixing sodium nitrate and water. To calculate the molarity of the solution, Josh should calculate the moles of which substance, and why?

sodium nitrate, because it is the solute

Which factor influences both solubility and the rate of dissolution?

temperature

A can of soda contains many ingredients, including vanilla, caffeine, sugar, and water. Which ingredient is the solvent?

water