NaCl Dilution – Theory Only (MCQ)

What happens to the concentration of NaCl when water is added to the solution?

• Increases

• Decreases

• Stays the same

• Becomes saturated

What is the correct formula used for dilution calculations?

• V₁ + V₂ = V₃

• M₁V₁ = M₂V₂

• n = C × V²

• m = V/M

Which unit is typically used for concentration in dilution calculations?

• g

• mol

• mol/L

• mL

If the volume of a solution is doubled, what happens to the concentration?

• Becomes zero

• Becomes half

• Doubles

• Stays the same

Dilution is used to:

• Increase the number of Na⁺ and Cl⁻ ions

• Increase the temperature of a solution

• Decrease the concentration of a solution

• Crystallize the salt

The number of moles of NaCl after dilution is:

• Increased

• Decreased

• Unchanged

• Doubled

A 1 M NaCl solution diluted to 500 mL from 250 mL will result in:

• 0.5 M

• 1 M

• 2 M

• 0.25 M

Which of the following best defines dilution?

• Adding salt to a solution

• Removing salt from solution

• Increasing volume to reduce concentration

• Heating the solution

Which factor remains constant during a proper dilution?

• Volume

• Concentration

• Number of moles of solute

• Mass of solvent

Why do we perform dilution?

• To change the chemical identity

• To increase solubility

• To adjust concentration for experiments

• To evaporate water