Calcium carbonate when mixed with water result in the formation of Calcium hydroxide which is used as an antacid. The chloride ion also helps in the whitening of teeth thus finding its use as an ingredient in toothpaste.
Iron oxide is dark pigment which is naturally used in makeup.
Therefore the answer to this question is Swap the uses for iron oxide and calcium carbonate.
Answer:
the answer is swap the uses for iron oxide and calcium carbonate. on edg
