Measures of Concentration: Molarity

Question 1

best

Revolt · Accepted Answer

moles of NaCl per liter of solution

Question 2

A student takes a measured volume of 3.00 M HCl to prepare a 50.0 mL sample of 1.80 M HCl. What volume of 3.00 M HCl did the student use to make the sample?Use .

Revolt · Accepted Answer

30.0 mL

Question 3

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?Use and .

Revolt · Accepted Answer

0.400 M

Question 4

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?

Revolt · Accepted Answer

sodium nitrate, because it is the solute

Question 5

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?Use .

Revolt · Accepted Answer

6.94 mL

Question 6

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?Use .

Revolt · Accepted Answer

0.300 M

Question 7

most

Revolt · Accepted Answer

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

Question 8

Which is a way to express concentration of a solution?

Revolt · Accepted Answer

parts per billion

Question 9

best

Revolt · Accepted Answer

[K2CrO4] = 1.75 M

Question 10

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?Use .

Revolt · Accepted Answer

200 g

Measures of Concentration: Molarity Answers

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