noun

molarity

moh-LARR-uh-tee

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Molarity (noun) means a measure of the concentration of a solution, given as the number of moles of dissolved substance per litre of solution. Example: “Calculate the molarity of a solution containing 0.5 moles of sodium chloride in 2 litres of water.”

noun

A measure of the concentration of a solution, given as the number of moles of dissolved substance per litre of solution.

"Calculate the molarity of a solution containing 0.5 moles of sodium chloride in 2 litres of water."

"The acid was diluted to a molarity of 0.1 M."

How to use molarity

Learner’s notes

In plain EnglishHow much of a substance is dissolved in each litre of liquid.

When to use it

Technical chemistry term.

Memory tip

Molarity has an r, and so does litre; molality has an l, like kilogram of solvent.

Trace the full origin ↓

Easily confused with

molality → molar mass normality →

Common pairings

calculate the molarity molarity of a solution 1 M solution molarity and molality

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C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

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Fill the gap

Can you complete this real example?

Calculate the _____ of a solution containing 0.5 moles of sodium chloride in 2 litres of water.

Etymology

Formed from mole, the chemical unit of amount, which comes from German Mol, a shortening of Molekulargewicht 'molecular weight'.

Origin: English

Synonyms

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Related words

million grand Ms yard thou meter metre mib

Rhymes for molarity

city pity deity acuity parity entity brevity opacity paucity ability quality reality

See all rhymes for molarity →

Frequently asked questions

What is the difference between molarity and molality?

Molarity is moles of solute per litre of solution, while molality is moles of solute per kilogram of solvent. Molality does not change with temperature, because mass does not expand, which is why it is preferred in work involving heating and cooling.

How do you calculate molarity?

Divide the number of moles of solute by the volume of the solution in litres. So 0.5 moles in 0.25 litres gives a molarity of 2 M.

What does M mean in chemistry?

A capital M after a number is the unit of molarity, read as 'molar'. A 3 M solution contains three moles of the dissolved substance in every litre.

What is the meaning of molarity?

"molarity" (noun) means a measure of the concentration of a solution, given as the number of moles of dissolved substance per litre of solution.

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