C

Concentration

C = n/V (mol/L) or mass/volume (g/L) or ppm (mg/L)
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Quick Reference
Formula / NotationC = n/V (mol/L) or mass/volume (g/L) or ppm (mg/L)
Also Known AsMolarity, Molality, Normality, Parts per million

What is Concentration?

Concentration is the amount of solute dissolved in a given volume or mass of solvent or solution. Common units include molarity (mol/L), molality (mol/kg), mass percent (%), and parts per million (ppm). Concentration affects reaction rates, colligative properties, and the position of equilibrium. It is fundamental to quantitative analytical and preparative chemistry.

Formula & Notation

C = n/V (mol/L) or mass/volume (g/L) or ppm (mg/L)

Other Names / Synonyms: Molarity, Molality, Normality, Parts per million

Properties & Characteristics

Expressions of concentration: Molarity (M) = mol solute / L solution. Molality (m) = mol solute / kg solvent (temperature independent). Mole fraction (χ) = mol component / total mol. Mass percent (%) = (mass solute / mass solution) × 100. Parts per million (ppm) = mg/L for aqueous solutions. Normality (N) = equivalents/L. For dilutions: C₁V₁ = C₂V₂.

Uses & Applications

Preparing reagents for laboratory reactions. Expressing drug concentrations in pharmaceutical formulations. Water quality standards (maximum contaminant levels in ppm). Seawater salinity (~35 ppt). Blood glucose levels (~5 mM). Industrial process control. Analytical calibration standards. Air pollutant concentrations.

Safety Information

High concentration solutions are generally more hazardous. Concentrated acids and bases cause more severe burns than dilute versions. Always dilute concentrated solutions carefully — add concentrated solution to water, not water to concentrated acid. Label all solutions with concentration, date, and hazard information.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Concentration
Formula C = n/V (mol/L) or mass/volume (g/L) or ppm (mg/L)
Synonyms Molarity, Molality, Normality, Parts per million

Frequently Asked Questions

Concentration is the amount of solute dissolved in a given volume or mass of solvent or solution. Common units include molarity (mol/L), molality (mol/kg), mass percent (%), and parts per million (ppm). Concentration affects reaction rates, colligative properties, and the position of equilibrium. It is fundamental to quantitative analytical and preparative chemistry.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.