Calculate Mass Required for Molar Solution
The molarity calculator calculates the mass of compound required to achieve a specific molar concentration and volume. To dilute a solution of known molarity, please use the Solution Dilution Calculator. To dilute a solution of concentrated acid or base of known w/w% strength, please use the Acid & Base Molarity Calculator.
How to calculate mass
Mass, molar concentration, volume, and formula weight are related to each other as follows:
Mass (g) = Concentration (mol/L) * Volume (L) * Formula Weight (g/mol)
What is mass?
Mass (m) is the amount of matter present in a substance. The value is constant and, unlike weight, is not affected by gravity.
What is formula weight?
Formula weight (F.W.) is the sum of the atomic weights of all atoms in a given empirical formula. For example: sodium chloride (NaCl) has one atom of sodium (Na) and one atom of chlorine (Cl). The atomic weight of sodium is 22.99 g/mol and chlorine is 35.45 g/mol. Therefore, the formula weight of NaCl is 58.44 g/mol (22.99 g/mol + 35.45 g/mol).
What is molar concentration?
Molar concentration is the amount of a solute present in one unit of a solution. Its units are mol/L, mol/dm3, or mol/m3. Molar concentration, also known as molarity, and can be denoted by the unit M, molar. To prepare 1 L of 0.5 M sodium chloride solution, then, as per the formula, use 29.22 g of sodium chloride (0.5 mol/L * 1L * 58.44 g/mol = 29.22 g).
FAQs
Molarity is the number of moles of solute per liter of solution. The formula to calculate molarity is: molarity = moles of solute / liters of solution. You can use a molarity calculator like the one on Omnicalculator to calculate molarity.
What is the formula for molarity trick? ›
% by weight x 10xd Molarity = GMM where d is density and GMM is gram molecular mass. Derive the formula : Molarity = (% by weight × 10 × d )/ GMM Here d is density and GMM is gram molecular mass .
What is the formula for molarity of a substance with molecular weight? ›
As mass/volume = molarity × molar mass , then mass / (volume × molar mass) = molarity . Substitute the known values to calculate the molarity: molarity = 5 / (1.2 × 36.46) = 0.114 mol/l = 0.114 M . You can also use this molarity calculator to find the mass concentration or molar mass.
How to convert g mol to molarity? ›
Divide the given concentration in g/L by the molar mass of the substance. This will give you the concentration in mol/L. So, the formula to convert g/L to mol/L is: mol/L = g/L Molar mass (g/mol) The result will be in moles per liter (mol/L), which is a measure of molarity.
What is molarity for dummies? ›
The units of molarity are always moles per liter (mol/L or mol·L–1). These units are often abbreviated as M and referred to as "molar." Thus, 0.25 M KOH(aq) is described as "Point two-five molar potassium hydroxide," and it contains 0.25 mol of KOH per liter of solution.
Which is the correct formula for calculating molarity? ›
There are many equations that can be used to express the solute concentration in a solution. The molarity formula, Molarity (M) = moles of solute/liters of solution = mol/L, relates moles of solute to the liter volume of solution and uses the units of mol/L.
How to convert concentration to molarity? ›
Convert the percentage to a decimal by dividing by 100. Multiply the decimal by the total volume of the solution to find the mass of the solute. Divide the mass of the solute by the molar mass to find the number of moles. Divide the number of moles by the volume of the solution in liters to find the molarity.
What is the formula for calculating molar concentration? ›
The molar concentration is the ratio of the amount of solute in moles per volume of solution in litres. The equation for molar concentration is 𝑛 = 𝑐 𝑉 , where 𝑛 is the amount of solute in moles, 𝑐 is the molar concentration, and 𝑉 is the volume of the solution in litres.
How to calculate the molality of a solution? ›
The formula for molality is m = moles of solute / kilograms of solvent. In problem solving involving molality, we sometimes need to use additional formulas to get to the final answer. One formula we need to be aware of is the formula for density, which is d = m / v, where d is density, m is mass and v is volume.
How do you calculate the molarity of water? ›
And the molecular mass of pure water is, (1*2)+(2*16)= 18 grams. Thus the pure water has a molarity of 55.56 mol/litre.
Calculating Molarity with Moles and Volume
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?
How do you calculate molality? ›
molality = moles of solute / mass of solvent (kg) .
What are the ways to express molarity? ›
It can be expressed in several ways: molarity (moles of solute per liter of solution); mole fraction, the ratio of the number of moles of solute to the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams ...
How do you calculate effective molarity? ›
Effective molarity is calculated by dividing kintra by (2.20 ± 0.03) × 104 M−1 s−1, the value of the corresponding bimolecular rate constant (kcat/KM) (Figure 3A).
