Molarity and Solution Preparation Calculator

Easily calculate the molar concentration of solutions or find the amount of substance needed to prepare a solution of certain molarity.

Select the Type of Calculation You Want to Perform

Calculate Molarity

This calculator calculates **molarity**, which is the amount of solute (moles) in one liter of solution. It is a fundamental concept for understanding chemical reactions and solution preparation processes.

Formula:

Number of Moles (mol) = Mass of Solute (gram) / Molar Mass of Solute (g/mol)
Molarity (M) = Number of Moles (mol) / Solution Volume (Liters)

Example: When 58.44 grams of NaCl (Molar mass 58.44 g/mol) is dissolved in 1 liter of water, molarity: Mole = 58.44 / 58.44 = 1 mole. Molarity = 1 mole / 1 L = 1 M.

Prepare Solution at Target Molarity

This calculator helps you find out how much of the original substance you need to prepare a new solution of a certain molarity and volume from a concentrated acid solution (e.g. 90% acetic acid). This is especially critical for precise solution preparation processes in laboratories and industrial applications.

Simplified Form of Formulas Used:

Moles Required = Target Molarity (M) × Target Volume (L)
Mass of Pure Substance Required (g) = Mole Required × Molar Mass (g/mol)
Required Concentrated Solution Mass (g) = Required Pure Substance Mass / (Purity Percentage / 100)
Required Concentrated Solution Volume (mL) = Required Concentrated Solution Mass (g) / Concentrated Solution Density (g/mL)

Remember, the calculated concentrated solution volume must be diluted by adding enough solvent (usually water) to reach the specified target solution volume. For example, if you have 10 mL of concentrated acid and a target volume of 1000 mL, you must add enough water after adding the concentrated acid to make the total volume 1000 mL.

This calculator is designed to apply the basic principles of molarity and solution preparation. In real laboratory and industrial applications, temperature, pressure, acid solubility in water, and other physical properties can affect concentration. For precise applications, it is recommended to use standard laboratory procedures and equipment. The molar mass is assumed to be 60.052 g/mol for **Acetic Acid (CH₃COOH)**.