Practice problems. Problem 1: Find the concentration of NaOH in a solution if 10 moles of NaOH is dissolved in the 1.00 L of water? 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. The concentration of solution formula is given as follows. (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. If the concentration of Na + ion in this solution is 0,2 molar, find x in the formula of compound. The moles of solute present in the solution. The gram formula mass of a substance is known as the mass of one mole. Hence it is important to understand all the methods of expressing concentration of solutions. 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 relationship between two solutions with the same amount of moles of solute can be represented by the formula c 1 V 1 = c 2 V 2, where c is concentration and V is volume. Molar Concentration Calculator. Molarity is sometimes indicated by an M, which means moles per liter. You will usually see Chemists working with the number of moles. To calculate molality we use the equation: Top Mole Fraction. Pharmacists will use percentage concentrations instead of the number of moles. Problem 2: The molar concentration of sulphuric acid is 4.00 mol L −1.Find the mass concentration … Find the molar concentration when 450.0 g of copper (II) sulfate is added to enough water to make 2500.0 ml of solution The mass, number of moles, concentration or volume of a substance can be calculated easily if you learn two formula triangles. 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. The molar mass of sodium hydroxide is 40 g mol −1. The most common units are molarity, molality, normality, mass percent, volume percent, and mole fraction. Here is the simple online molar concentration calculator to calculate the molarity substance which is expressed as mol/L. 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. Molarity calculation is used in teaching, laboratory, study and research. Key Terms dilution : The process by which a solution is made less concentrated via addition of more solvent. 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. 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