Molarity is the number of moles of solute dissolved per liter of solution. A 1 M solution contains 1 mol of solute per liter.

What is the difference between molarity and molality?

Molarity (M) is moles per liter of solution; molality (m) is moles per kilogram of solvent. Molarity changes with temperature; molality does not.

How do I find molar mass?

Use the Molecular Weight Calculator on this site, or look up the compound in a reference. Molar mass equals the sum of atomic weights of all atoms in the formula.

What units does volume need to be in?

Enter volume in liters (L). Convert milliliters by dividing by 1000 (e.g., 250 mL = 0.25 L).

What is a standard solution?

A standard solution is one whose concentration is precisely known, typically prepared by dissolving a precisely weighed amount of a primary standard in a volumetric flask.

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Molarity Calculator — Molality Concentration Formula

Calculate molarity, moles, or volume for any solution using the M = n/V formula.

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How to use this calculator

👉 Fill in the boxes below and your answer appears instantly — no maths needed, we do it all for you! 🎉

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In plain English — what does this do?

📊 A helper for daily life! Things like working out your age, how much to tip, what a sale price is, or how long until your birthday. Quick and easy answers for real life!

📌 Direct Answer & Summary

The Molarity Calculator solves for molarity (M), moles (n), or volume (V) of a solution using the fundamental chemistry equation M = n / V. It can also convert from mass and molar mass to moles automatically.

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Moles (mol)

Volume (L)

What is Molarity Calculator — Molality Concentration Formula?

How to use it

1️⃣ Select what you want to find: Molarity, Moles, or Volume.
2️⃣ Enter the two known values for your chosen mode.
3️⃣ For molarity from mass, enter the mass in grams and the molar mass in g/mol.
4️⃣ Click Calculate to see the result with the formula used.
5️⃣ Use the Molecular Weight Calculator to find the molar mass of your compound.

Formula

M = n / V. n = M × V. V = n / M. Where M is molarity in mol/L, n is moles, and V is volume in liters. Moles from mass: n = mass (g) / molar mass (g/mol).

💡 See it in action — a real example

To make a 0.5 M NaCl solution (molar mass 58.44 g/mol) with 250 mL: moles needed = 0.5 × 0.25 = 0.125 mol. Mass = 0.125 × 58.44 = 7.31 g NaCl.

❓ Common questions

What is molarity?: Molarity is the number of moles of solute dissolved per liter of solution. A 1 M solution contains 1 mol of solute per liter.
What is the difference between molarity and molality?: Molarity (M) is moles per liter of solution; molality (m) is moles per kilogram of solvent. Molarity changes with temperature; molality does not.
How do I find molar mass?: Use the Molecular Weight Calculator on this site, or look up the compound in a reference. Molar mass equals the sum of atomic weights of all atoms in the formula.
What units does volume need to be in?: Enter volume in liters (L). Convert milliliters by dividing by 1000 (e.g., 250 mL = 0.25 L).
What is a standard solution?: A standard solution is one whose concentration is precisely known, typically prepared by dissolving a precisely weighed amount of a primary standard in a volumetric flask.

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