Molarity Converter

Convert between mol/L, mmol/L, mEq/L, and other concentration units

From:

ℹ️

To:

ℹ️

Conversion Formula:

mmol/L = mol/L × 1000

From:

Moles per liter (mol/L)ℹ️

To:

Millimoles per liter (mmol/L)ℹ️

Common Molarity Conversions

Understanding Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is denoted by M, and is commonly used in chemistry and biochemistry.

Different Units of Concentration:

Molarity (M or mol/L): Moles of solute per liter of solution
Molality (mol/kg): Moles of solute per kilogram of solvent
Normality (N or Eq/L): Gram equivalents of solute per liter of solution
Parts per million (ppm): Mass of solute (mg) per mass of solution (kg)
Parts per billion (ppb): Mass of solute (μg) per mass of solution (kg)

Calculation Example:

To prepare 1 L of 1 M NaCl solution:
1 mol/L × 58.44 g/mol × 1 L = 58.44 g of NaCl needed

Dilution Formula

M₁V₁ = M₂V₂

Where:
M₁ = Initial molarity
V₁ = Initial volume
M₂ = Final molarity
V₂ = Final volume

This formula is useful for calculating how to dilute a stock solution to a desired concentration.

Applications of Molarity

Laboratory

Preparation of buffer solutions
Standardization of analytical methods
Titrations and chemical reactions
Spectrophotometric analysis

Medicine

Blood electrolyte measurements
Drug formulations and dosing
IV fluid preparation
Diagnostic testing

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Molarity Visualized

1.000 mol/L

Medium Concentration

Similar to: Standard laboratory solution

1 molar (1M) solution, common concentration for reagents

Common Solutions

Household bleach (NaOCl)0.7 - 1.0 mol/L

Vinegar (acetic acid)0.8 - 1.0 mol/L

Typical lab HCl1.0 mol/L

Seawater (NaCl)0.6 mol/L

Soft drink carbonation0.03 - 0.05 mol/L

Blood glucose (normal)5 mmol/L

Tips for Working with Molarity

Temperature Effects: Volume changes with temperature, so molarity can vary slightly. For precision work, specify the temperature.
Preparation: Always dissolve the solute completely before diluting to the final volume.
Storage: Label solutions with concentration, date prepared, and your initials.
Precision: For very accurate solutions, use volumetric flasks rather than measuring cylinders or beakers.

About the Molarity Converter

Convert between mol/L, mmol/L, mEq/L, and other concentration units All conversions run instantly in your browser and nothing you enter is sent to a server.

Common Conversion Formulas

From	To	Formula
Molarity (M)	Moles (n), Volume (V in L)	M = n / V
Millimolar (mM)	Molar (M)	mM = M × 1,000
Milliequivalents per liter (mEq/L)	Millimolar (mM), Valence (z)	mEq/L = mM × z