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Jan 30, 2024 · This molarity calculator is a tool for converting the mass concentration of any solution to molar concentration (or recalculating grams per ml to moles). You can also calculate the mass of a substance needed to achieve a desired molarity.
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Molarity Calculator. Please provide any three values in the fields below to calculate the fourth value in the molarity equation for solutions: Molarity = Mass Molecular Weight × Volume. Molarity (M) is one of the most commonly used units for measuring the concentration of a solution in chemistry.
- Overview
- Calculating Molarity with Moles and Volume
- Calculating Molarity with Mass and Volume
- Calculating Molarity with Moles and Milliliters
- Additional Practice Problem
Molarity describes the relationship between moles of a solute and the volume of a solution.
To calculate molarity, you can start with moles and volume, mass and volume, or moles and milliliters. Plugging these variables into the basic formula for calculating molarity will give you the correct answer.
Know the basic formula for calculating molarity.
Molarity is equal to the number of moles of a solute divided by the volume of the solution in liters. As such, it is written as:
molarity = moles of solute / liters of solution
Example problem: What is the molarity of a solution containing 0.75 mol NaCl in 4.2 liters?
Finding molarity demands that you have the number of moles and the number of liters. If the problem provides each of these figures, no preliminary calculations are needed.
Moles = 0.75 mol NaCl
Know the basic formula for calculating molarity.
Molarity expresses the relationship between the number of moles of a solute per liters of solution, or the volume of that solution. In formula form, molarity is expressed as:
molarity = moles of solute / liters of solution
Example problem: What is the molarity of a solution made by dissolving 3.4 g of KMnO
in 5.2 liters of water?
Finding molarity demands that you have the number of moles and the number of liters. If you are not provided with the number of moles but you do have the volume and mass of the solution, you will need to use these two figures to calculate the number of moles before continuing on.
Know the basic formula for calculating molarity.
In order to find molarity, you need to calculate the number of moles of solute for a solution per liter of solution. Milliliters cannot be used. The general formula used to express molarity is written as:
molarity = moles of solute / liters of solution
Example problem: What is the molarity of a solution containing 1.2 moles CaCl
Calculating molarity requires you to have the number of moles and the number of liters. If you are provided with the volume in milliliters instead of liters, you will need to convert the volume into liters before continuing your calculations.
Moles = 1.2 mol CaCl
Find the molarity of a solution made by dissolving 5.2 g of NaCl in 800 ml of water.
Identify the values provided to you in the problem: mass in grams and volume in milliliters.
Mass = 5.2 g NaCl
Volume = 800 ml water
Find the molar mass of NaCl.
Do this by adding together the molar mass of sodium, Na, and the molar mass of chlorine, Cl.
Use the Molarity Calculator to calculate the mass, volume or molar concentration required to prepare a solution of compound of known molecular weight.
Our calculator provides quick results, allowing you to determine molarity in various units—liters (L), milliliters (mL), microliters (µL), or nanoliters (nL). You can also easily calculate the amount of solute required to prepare any solution, saving you time and effort in the lab.
Calculate the molarity of a solution with our molar concentration calculator. Plus learn the molarity formulas and how to solve mass & volume
Sep 12, 2024 · To calculate moles, you just need the mass of the chemical compound and its molar mass (also known molecular weight). You can find the molar mass on the periodic table or in your chemistry textbook. For example, let’s say you have 58.44 grams of table salt (NaCl).
