To prepare the solution we place 4.0 g of NaOH, weighed to the nearest tenth of a gram, in a bottle or beaker and add approximately 500 mL of water. Since the concentration only needs to be known to two significant figures, the mass of NaOH and volume of solution do not need to be measured exactly. Mass (g) = Concentration (mol/L) * Volume (L) * Formula Weight (g/mol)įor example, if we want to prepare 500 mL of approximately 0.20 mol/L NaOH using solid NaOH. Mass, molar concentration, volume, and formula weight are related to each other as follows: To prepare a solution where the solute’s concentration is given as a volume percent, you would measure out an appropriate volume of solute and add sufficient solvent to obtain the desired total volume.

For example, to prepare a solution with a desired molarity you would weigh out an appropriate mass of the reagent, dissolve it in a portion of solvent, and bring to the desired volume. Exactly how this is done depends on the required concentration units. The Selleck molarity calculator is based on the following equation: Mass (mg) Concentration (mM) × Volume (mL) × Molecular Weight (g/mol) When preparing stock solutions, please always use the batch-specific molecular weight of the product found on. Molarity of an acid or base can be calculated by giving the inputs of molecular weight, density and weight percentage. Calculate the mass, volume or concentration required for a solution. See also our Percent () Solutions Calculator for a definition of percent solutions.

See our Molar Solution Concentration Calculator for a definition of molarity and molar solutions. A stock solution is prepared by weighing out an appropriate portion of a pure solid or by measuring out an appropriate volume of a pure liquid and diluting to a known volume. Molarity Calculator Determines the molarity of an acid or base solution from the given concentrated acid or base solution. Meant to be used in both the teaching and research laboratory, this calculator (see below) can be utilized to perform dilution calculations when working with molar or percent () solutions.

Molarity chemistry calculator