If there has been an error when the unknown mixture (salt&sand) were prepared and KCl instead of NaCl was used, how would that affect the mass percent of salt? Why:
a. The mass percent of salt would increase, as KCl is heavier than NaCl.
b. The mass percent of salt would decrease, as KCl is lighter than NaCl.
c. The mass percent of salt would remain the same, as KCl and NaCl have similar masses.
d. Cannot be determined.