Key Terms dilution : The process by which a solution is made less concentrated via addition of more solvent. Here is the simple online molar concentration calculator to calculate the molarity substance which is expressed as mol/L. If molar concentration of SO 4-2 ion is 0,4 molar, find molar concentration of Al 2 (SO 4)3. The molar mass of sodium hydroxide is 40 g mol −1. Concentration = moles / volume Concentration is given in mol/dm 3 , properly written as moldm -3 but this notation is often not used until post-16 level. Molarity calculation is used in teaching, laboratory, study and research. The mass, number of moles, concentration or volume of a substance can be calculated easily if you learn two formula triangles. The mole fraction, X, of a component in a solution is the ratio of the number of moles of that component to the total number of moles of all components in the solution. The mass of solvent (in kilograms) in the solution. The moles of solute present in the solution. Molarity is sometimes indicated by an M, which means moles per liter. General formula: The molar concentration is calculated as the mol of a substance in 1 L of solution, thus:, it is also possible to use the mass in gram of the substance and the conversion to mole is made using the molecular weight (MW): A solution with a salt concentration of 1 M has 1 mol of solute in 1 L of solution. (Na 2 SO 4 =142 and H 2 O=18) Solution: We first find moles of Na+ ion using following concentration formula; [Na +]=n Na + /V. Problem 2: The molar concentration of sulphuric acid is 4.00 mol L −1.Find the mass concentration … It is defined as the number of moles of solute dissolved in a liter of solution and formula is defined as (m/v) x (1/MW). You will usually see Chemists working with the number of moles. The gram formula mass of a substance is known as the mass of one mole. The formula for calculating molar concentration, known as molarity, is the total moles of the solute divided by the total amount of the solution in liters. Pharmacists will use percentage concentrations instead of the number of moles. Concentration is an expression of how much solute is dissolved in a solvent in a chemical solution.There are multiple units of concentration.Which unit you use depends on how you intend to use the chemical solution. The most common units are molarity, molality, normality, mass percent, volume percent, and mole fraction. Concentration is the number of moles of a substance dissolved in one decimetre cubed (dm3) which is 1000cm 3 or 1 litre, usually in pure water. The concentration of solution formula is given as follows. Problem 1: Find the concentration of NaOH in a solution if 10 moles of NaOH is dissolved in the 1.00 L of water? If the concentration of Na + ion in this solution is 0,2 molar, find x in the formula of compound. 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