Parts of Solute By Parts of Solution, Molarity and Molality

Concentration

The amount of solute present in a solution

Parts of Solute by Parts of Solution

Includes mass percent, volume percent, percentage by mass per volume, parts per million and parts per billion

Percentage by Mass

Also known as Mass Percent or Weight Percent

Mass Percent

Defined as the mass of solute per mass of the solution

Percent

Means one hundred

Mass Fraction x 100

How Mass Percent is Expressed

Mass Percent

Used for solid chemicals to indicate purity by mass

Percentage By Volume

Also known as Volume Percent

Volume Percent

Defined as the volume of solute per volume of the solution

Volume Faction x 100

How Volume Percent expressed

Volume Percent

Used to express liquid-liquid solutions

Proof

Used as unit for alcohol concentration

Proof

2 times the percentage by volume of alcohol in the solution

Percentage By Mass Per Volume

Also Known as Percentage By Weight Per Volume

Percentage By Mass Per Volume

Defined as the mass of solute per volume of the solution

Percentage By Mass Per Volume

Used to express Aqueous Solutions

Formal Units for Concentration

Includes Molarity, Molality and Normality

Molarity

Used to express Aqueous Solutions where the solute is solid

Molarity

M

Molarity

defined as the number of moles of the solute dissolved in one liter of the solution

Molarity

Susceptible to temperature changes

M

Read as Molar

Molality

defined as the number of moles of solute dissolved in one kilogram of the solvent

m

Read as Molal

Molality

m

Molality

Independent to temperature changes