Molarity and Dilutions

What volume, in milliliters, of 10.0 M NaOH is needed to prepare 300.0 mL of 2.00 M NaOH by dilution?

• 0.067 mL

• 60.0 mL

• 100 mL

• 125 mL

How many mL of 10.8M HCl are required to make 100.0 mL of 3.00M acid?

• 27.8 mL

• 27.78 mL

• 2.8 mL

• 278 mL

What volume of 1.50 M KBr can be made from 15.6 mL of concentrated KBr with a molarity of 9.65 M?

• 150. mL

• 151 mL

• 1.00 L

• 100. mL

What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO₃ to a volume of 250 mL?

• 15.9 M

• 0.636 M

• 0.642 M

• 1.59 M

 A teacher starts with 0.250 L of a 0.0150 M HBr solution and dilutes it to 0.750 L. What is the concentration of HBr in the new solution?

• 0.005 M

• 0.045 M

• 12.5 M

• 7.5 M

Which of these is the CORRECT equation for solving for Molarity?

• M = mol / mL

• M = mol / L

• M= mL / mol

• M = L / mol

A student wants to make 100. mL of 0.25 M C₆H₁₂O₆ by diluting a 1.3 M C₆H₁₂O₆ solution. How much of that solution should be used? Which answer shows the correct way to solve this problem?

• (100. X 0.25) / 1.3

• (100. X 1.3) / 0.25

• 100. / (1.3 X 0.25)

• (1.3 X 0.25) / 100.

What is the definition of molarity?

• The mass of a substance in grams

• The number of particles in a substance

• The number of moles of solute per liter of solution

• The volume of solvent in liters

Tags

NGSS.HS-PS1-5

If you are given grams of solute, what must you do before you can solve for Molarity?

• divide grams by the formula mass

• multiply grams by the formula mass

• nothing, use grams

• divide the formula mass by the volume

What is the molarity of a solution that contains 5 moles of solute in 2 liters of solution?

• 2.5 M

• 5 M

• 10 M

• 0.4 M