Lesson: Dilutions

Dilution

Dilution is the process of decreasing the concentration of a solute in a solution, usually simply by mixing with more solvent like adding more water to the solution.

But how much solvent to make what new diluted molarity?

Use the Dilution Equation

Steps in solving dilution problems.

1) identified the known and unknown variables, M₁, V₁, M₂, and V₂.

2) Make sure M is in Molarity and V is the same units (mL or L).

3) Rearrange the dilution eqution to solve for the unknown.

4) subsitute in the known variables and solve.

Multiple Choice

Which of the following is the Dilution Formula?

• V₁M₁ = V₂M₂

• M = m/V

• V = mT

• PV = nRT

Multiple Choice

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

​Notice the M will cancle out.

Multiple Choice

What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO₃ to a volume of 250.0 mL?

• 15.9 M

• 0.636 M

• 0.642 M

• 1.59 M

​Notice the mL will cancle out.

Multiple Choice

If I have 340.0 mL of a 0.500 M NaBr solution, what will the concentration be if I add 560.0 mL more water to it? (Remember to use the total new volume)

• .188 M

• 3.78 M

• .389 M

• 1.76 M

Math Response

How many mL of 10.8M HCl are required to make 100.0 mL of 3.00M acid? Answer to 2 decimal places.

Type answer here

Correct Answer: 27.78

Deg^°

Rad