In this lab, the percent composition of each component in the mixture was calculated. The mixture contained NaCO, CaCO3, and sand. NaCO or salt had a physical change when it completely dissolved in water. A chemical change occurred when hydrochloric acid was added to CaCO3 or chalk because the mixture changed to a yellow green color. In order to obtain the percent composition, a filtration system was used to separate the sand from the liquid, by straining the solid with the use of filter paper. Evaporation or heating the liquid mixture separated the liquid in the form of vapor was also used in order to get the salt alone. A chemical change also occurred when hydrochloric acid was added to the filtration system because bubbles were visible.
