Molarity to Concentration Calculator

A molarity to concentration calculator is a conversion tool designed to convert between molarity (M) and concentration using Concentration (g/L) = Molarity (mol/L) × Molecular Weight (g/mol) formula.

The calculator typically requires input values such as:

• Molecular weight of the solute
• Molarity of the solution
• Solution volume

Suppose you have a 2.5 M solution of sodium chloride (NaCl). Using the calculator with NaCl’s molecular weight (58.44 g/mol), you can quickly determine that the concentration is 146.1 g/L.

Molarity to Concentration Calculator

Compound	Molarity (M)	Molecular Weight (g/mol)	Concentration (g/L)
NaCl	2.0	58.44	116.88
KOH	1.5	56.11	84.17
CaCl₂	0.5	110.98	55.49
HCl	3.0	36.46	109.38
Na₂CO₃	1.0	105.99	105.99
H₂SO₄	1.5	98.079	147.12
C₆H₁₂O₆ (Glucose)	0.75	180.156	135.12
NH₄Cl	2.0	53.49	106.98
MgSO₄	1.0	120.37	120.37
CH₃COOH (Acetic Acid)	1.0	60.05	60.05
NaHCO₃	1.5	84.01	126.02
K₂SO₄	0.75	174.26	130.95
BaCl₂	0.25	137.33	34.33
C₁₂H₂₂O₁₁ (Sucrose)	0.5	342.30	171.15
LiOH	2.0	23.95	47.90

Molarity to Concentration Conversion Formula

The formula for converting molarity to concentration is:

Concentration (g/L) = Molarity (mol/L) × Molecular Weight (g/mol)

Let’s convert 1.5 M H₂SO₄ to g/L:

• Molecular weight of H₂SO₄ = 98.079 g/mol
• Molarity = 1.5 mol/L
• Concentration = 1.5 mol/L × 98.079 g/mol
• Concentration = 147.12 g/L

How to Convert Molarity to Concentration?

Converting molarity to concentration involves a systematic approach:

• Identify the Molecular Weight: Look up the molecular weight of your compound.
• Verify the Molarity: Confirm the molarity value.
• Apply the Conversion Formula: Multiply molarity by molecular weight.

Converting 0.75 M glucose (C₆H₁₂O₆) to g/L:

Molecular weight of glucose = 180.156 g/mol

Given molarity = 0.75 mol/L

Concentration = 0.75 mol/L × 180.156 g/mol

Final concentration = 135.12 g/L

Is Molarity the Same as Concentration?

While related, molarity and concentration are distinct concepts in chemistry:

• Molarity specifically refers to the number of moles of solute per liter of solution (mol/L), while concentration can be expressed in various units (g/L, mg/mL, ppm, etc.).

Key Differences Include:

• Molarity is temperature-dependent due to volume changes.
• Mass concentration remains constant regardless of temperature.
• Molarity directly relates to chemical reactions.
• Concentration is more practical for solution preparation.

Consider a 1 M NaOH solution:

• Molarity = 1 mol/L
• Molecular weight = 40 g/mol
• Mass concentration = 40 g/L

References

• American Chemical Society – Chemical Education Resources https://www.acs.org/education/resources.html
• Royal Society of Chemistry – Education Resources https://edu.rsc.org/resources

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