A student is supplied with 150.0 cm3 of a solution of 0.300 mol dm-3 calcium chloride, CaCl2\text{CaCl}_2CaCl2.
A student plans to dilute this solution so that the chloride concentration is 0.200 mol dm-3.
What volume of water, in cm3\text{cm}^3cm3, does the student need to add?
75.075.075.0
225.0225.0225.0
300.0300.0300.0
450.0450.0450.0