a solution is prepared by dissolving 50 g of calcium chloride in a 250ml volumetric flask which is then filled with distilled water up to the line-mark. Calculate the molar concentration of the solution.
mols CaCl2 = grams/molar mass
Then M = mols/L solution
a solution is prepared by dissolving 50 g of calcium chloride in a 250ml volumetric flask which is then filled with distilled water up to the line-mark. Calculate the molar concentration of the solution.
To calculate the molar concentration of a solution, you need to know the number of moles of solute (calcium chloride in this case) and the volume of the solution.
First, let's determine the number of moles of calcium chloride:
Step 1: Find the molar mass of calcium chloride (CaCl2)
The molar mass of calcium (Ca) is 40.08 g/mol, and the molar mass of chlorine (Cl) is 35.45 g/mol. Since calcium chloride consists of one calcium atom and two chlorine atoms, the molar mass of calcium chloride is:
40.08 g/mol + (2 × 35.45 g/mol) = 110.98 g/mol
Step 2: Calculate the number of moles
To calculate the number of moles, we'll use the formula: moles = mass / molar mass
moles of CaCl2 = 50 g / 110.98 g/mol = 0.450 mol
Next, we need to determine the volume of the solution. The volume given in the question is 250 mL (milliliters).
Finally, we can now calculate the molar concentration (Molarity) using the formula: Molarity (M) = moles of solute / volume of solution in liters
Step 3: Convert the volume to liters
Volume in liters = 250 mL / 1000 mL/L = 0.250 L
Step 4: Calculate the molar concentration
Molarity (M) = 0.450 mol / 0.250 L = 1.8 M
Therefore, the molar concentration of the calcium chloride solution is 1.8 M.