The densities of 3 different solutions, water, saltwater, and an unknown solution, were calculated using a triple beam balance and a graduated cylinder. Density was also used to discover how much zinc and copper are found in a penny. The following results were found: water’s density, 1.02 g mL-1; saltwater’s density, 1.05 g mL-1; and the unknown substance labeled two’s density, 1.04 g mL-1. The percent error was calculated for water’s density as 2%. The composition of a penny was calculated using volume by water displacement and the mass of the pennies. 7.20 g cm-1was the calculated average density of a modern penny. From these results it was concluded that saltwater is denser than water and the unknown substance is ethylene glycol. Also, the
