Dilutions

Which of the following is the Dilution Formula?

• V₁M₁ = V₂M₂

• M = m/V

• V = mT

• PV = nRT

When you make a dilution, which of these values remains constant?

• The molarity (M)

• The total moles of solute

• The volume (V)

• The concentration

Tags

NGSS.HS-PS1-7

How do we make a dilution?

• Add more solute

• Remove solute

• Remove solvent

• Add more solvent

As we dilute a solution.....

• The volume increases and the molarity (M) increases

• The volume increases and the molarity (M) decreases

• The volume decreases and the molarity (M) increases

• The volume decreases and the molarity (M) decreases

Tags

NGSS.HS-PS1-5

If the concentration of tube 1 is 150 ng/ml (tube 1 is now the starting stock solution) and 1 ml of sample is moved each time into 24 ml of diluent to complete 3 dilutions from the first tube, what is the concentration in tube #4 or the third dilution?

• 150 ng/ml

• 6 ng/ml

• 0.24 ng/ml

• 0.0096 ng/ml

If 1 mL sample is put into tube #1 that has 24 ml diluent, what is the tube dilution? What is the final dilution?

• Tube 1/25

• Final 1/50

• Tube 1/50

• Final 1/25

If 1 mL sample is put into tube #1 that has 24 ml diluent, what is the tube dilution? What is the final dilution?

• Tube 1/25

• Final 1/50

• Tube 1/50

• Final 1/25

How many mL of stock solution of 2M NaCl do you need to prepare 100 mL of 0.150M NaCl?

• 7.5 mL

• 15 mL

• 1333 mL

• 200 mL

A dilution is when

• solute is added to the volume of solution

• water is added to the volume of solution

• solute is removed from the volume of solution

• water is removed from the volume of solution

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