Molarity & Dilutions Bellringer

 If 0.325 moles of H2SO4 are dissolved in 450. mL of water, what is the molarity of the solution?

• 0.00072 M

• 0.72 M

• 1384.6 M

• 1.4 M

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

• M = mol / mL

• M = mol / L

• M= mL / mol

• M = L / mol

What is the molarity of a solution made by dissolving 44.5 g of KCN in enough water to make 0.750 L of solution?

• 0.9 M

• 59.3 M

• 86.7 M

• 1.09 M

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

If 0.825 liters of solution contains 0.025 moles of CaCl2, what is the molarity of the solution?

• 33 M

• 0.03 M

• 30.3 M

• 3.03 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

A chemist starts with 500. mL of a 2.5 M Ca(OH)2 solution and dilutes it to 950. mL.

Which option correctly identifies each variable?

• M1 = 500. mL

  V1 = 2.5 M

  V2 = 950. mL

  M2 = ?

• M1 = 2.5 M

  V1 = 950. mL

  M2 = 500. mL

  V2 = ?

• M1 = 2.5 M

  V1 = 500. mL

  M2 = ?

  V2 = 950 mL

 A student wants to make 275 mL of 3.00 M LiOH by diluting a 8.00 M LiOH solution. How much of that solution should be used?

• 0.09 mL

• 733.3 mL

• 103.125 mL

• 53.5 mL

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.

A teacher starts with 2.5 L of a 2.25 M HNO3 solution and dilutes it to 4.0 L. What is the concentration of HNO3 in the new solution?

• 4.4 M

• 3.6 M

• 0.7 M

• 1.4 M