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Calcimator

Reagent Preparation Calculator

Calculate the mass of solute needed to prepare a solution of desired molarity and volume, adjusted for reagent purity.

Inputs

M
cup
g/mol
%

Results

Grams Needed (Pure)

2.92 g

Actual Grams (Purity Adjusted)

2.95 g

Moles of Solute0.05 mol
Volume of Solvent500 mL
How to Use This Calculator
  1. Enter the target concentration (mol/L or mg/mL) and final volume in mL.
  2. Input the molecular weight of the reagent in g/mol.
  3. Set the stock solution concentration if diluting from a concentrated source.
  4. Review the mass to weigh (grams) or volume of stock to pipette.
  5. Record the lot number, preparation date, and expiration on the reagent label before use.

How the result changes with Desired Molarity

Desired MolarityGrams Needed (Pure)Actual Grams (Purity Adjusted)
258.44 g59.03 g
7204.54 g206.61 g
13379.86 g383.7 g
18525.96 g531.27 g

What each input means

Desired Molarity
Target molar concentration of the solution (moles per liter).
Desired Volume
Total volume of solution to prepare in milliliters.
Molecular Weight
Molecular weight of the solute in grams per mole (e.g., NaCl = 58.44).
Reagent Purity
Purity percentage of the reagent as listed on the bottle (e.g., 99%).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Desired Molarity = 0.1, Desired Volume = 500, Molecular Weight = 58.44, Reagent Purity = 99 = 4 input(s) provided
  2. Calculate Grams Needed
    Grams Needed
    2.922 = 2.922
  3. Calculate Actual Grams
    Actual Grams
    2.9515 = 2.9515
  4. Calculate Moles of Solute
    Moles of Solute
    0.05 = 0.05
  5. Calculate Volume of Solvent
    Volume of Solvent
    500 = 500

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