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A student is preparing 500 mL of a 0.1M solution of magnesium chloride to test the
effects of a solute on freezing point. The student uses the following steps to get
started.
Step 1: Measure 500 mL of water.
Step 2: Calculate the number of grams of magnesium chloride needed.
Step 3: Add the water to the magnesium chloride and stir until dissolved.
Step 4: Label the solution 0.1 M MgCl2.
In what step did this student make an error and what should be done to fix the error?