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Molarity & Dilution Calculator

Calculate molarity from mass, molar mass, and volume. Use the dilution equation M1V1 = M2V2. Or figure out how much solute to weigh for a target concentration.

Solution

1.00 M

Parameters

g
g/mol
L

Results

Molarity
1.000 M
Moles of solute
1.000 mol

Step-by-Step Calculation

1. Formula

M=nV=massmolar mass×VM = \frac{n}{V} = \frac{\text{mass}}{\text{molar mass} \times V}

2. Calculate moles

n=58.44 g58.44 g/mol=1.000 moln = \frac{58.44\text{ g}}{58.44\text{ g/mol}} = 1.000\text{ mol}

3. Calculate molarity

M=1.000 mol1 L=1.000 MM = \frac{1.000\text{ mol}}{1\text{ L}} = 1.000\text{ M}

Reference Guide

Molarity

Molarity (M) is the number of moles of solute per liter of solution. It is the most common unit for solution concentration in chemistry.

M=nV=moles of soluteliters of solutionM = \frac{n}{V} = \frac{\text{moles of solute}}{\text{liters of solution}}

Dilution Equation

When you dilute a solution, the number of moles of solute stays the same. This gives the dilution equation.

M1V1=M2V2M_1 V_1 = M_2 V_2

Solution Preparation

To prepare a solution of a specific molarity, calculate the required mass of solute: mass = M x V x molar mass.

Lab Tips

Always add solute to solvent, not the reverse. For acids, add acid to water ("do as you oughta, add acid to water"). Use a volumetric flask for precise volumes.