Dissolving sodium chloride in water will

raise the freezing point of the sodium chloride
lower the freezing point of the sodium chloride
lower the freezing point of the solution
raise the freezing point of the solution

What sources of error may have contributed to the percent yield not being 100 percent? think about things that may have led to inaccurate measurements or where mass of the product could have been lost if this experiment was conducted in a physical laboratory.