Question

0.200 mol of calcium fluoride, caf2, is added to 50.0 cm3 of distilled water which is then made up to a total volume of 250 cm3. determine the concentration of the solution, in mol dm–3.

Answer 1

To find the concentration of CaF2 solution in mol dm–3, divide the moles of CaF2 (0.200 mol) by the total volume of the solution after dilution (0.250 dm3), resulting in a concentration of 0.800 mol dm–3.

Step-by-step explanation:

To determine the concentration of the calcium fluoride (CaF2) solution in mol dm–3, we must calculate the molarity of the solution after dilution. The initial amount of CaF2 is 0.200 mol, and the final volume of the solution is 250 cm3 or 0.250 dm3. The molarity (M) is given by the number of moles of solute divided by the volume of the solution in dm3.

The calculation is:
Molarity = moles of solute / volume of solution in dm3
Molarity = 0.200 mol / 0.250 dm3
Molarity = 0.800 mol dm–3

Therefore, the concentration of the CaF2 solution is 0.800 mol dm–3.