Calculate the molarity of a solution that is prepared by dissolving 23.35g of CaCl2 in a sufficient amount of water to make a 600 mL solution.
To calculate the molarity of a solution, you need two pieces of information: the number of moles of solute and the volume of solution in liters.
Step by step, this is how you can find the molarity of the CaCl2 solution:
1. Convert the mass of CaCl2 to moles. To do this, use the molar mass of CaCl2, which is the sum of the atomic masses of calcium (Ca) and chlorine (Cl) multiplied by their respective subscripts (2 for chlorine in this case).
Molar mass of CaCl2 = (40.08 g/mol) + (35.45 g/mol * 2) = 110.98 g/mol
Number of moles = mass / molar mass
Number of moles = 23.35 g / 110.98 g/mol = 0.2102 mol
2. Convert the volume of the solution from milliliters to liters.
Volume of the solution = 600 mL = 600 mL * (1 L / 1000 mL) = 0.600 L
3. Calculate the molarity by dividing the number of moles of CaCl2 by the volume of the solution.
Molarity (M) = number of moles / volume of solution in liters
Molarity (M) = 0.2102 mol / 0.600 L = 0.35 M
Therefore, the molarity of the solution prepared by dissolving 23.35 g of CaCl2 in a sufficient amount of water to make a 600 mL solution is 0.35 M.