Question 1

What is Molarity (M)?

Accepted Answer

Molarity is the number of moles of solute dissolved per 1 Liter of solution: M = moles / Liters = (mass / Mw) / V. 1 Molar solution contains 1 mole in 1 Liter.

Question 2

How does the dilution equation M1·V1 = M2·V2 work?

Accepted Answer

Because adding solvent does not change the total moles of solute, initial moles (M₁·V₁) equals final moles (M₂·V₂). To prepare V₂ of concentration M₂, pipette V₁ = (M₂·V₂) / M₁ and add solvent to reach V₂.

Question 3

What is the difference between Molarity and Molality?

Accepted Answer

Molarity (M) is moles per Liter of total solution (temperature dependent due to liquid expansion). Molality (m) is moles per kilogram of pure solvent (temperature independent).

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