Density, Mass Divided By Volume Of Water

INTRODUCTION Density, mass divided by volume, is one of the most important characteristic of matter (Sciencing) since it affects whether objects will float or sink, thus making it hugely important for the workings of the universe and in daily live (Sciencing). All objects have density and that density can increase or decrease as the result of actions taken on the object (Sciencing), such as adding salt into a substance like water, as has been done in this particular experiment. When salt is dissolved in fresh water, the density of the water increases because the mass of the water increases (Manoa Hawaii), thus allowing objects which are less dense than the water to float. This phenomenon can be seen clearly in the Dead Sea, as the water there

100 mL beaker 2. Graduated Cylinder 3. Water (preferably distilled) 4. Grapes 5. Table salt 6. One straw 7. Eye dropper

80 mL of water was first poured into the cylinder, which was then transferred to the beaker. Salt was then added to the water in each pinch at 0.36 grams per pinch until the grape was able to float. Later, after recording the number of pinches of salt that took to float the grape, plain water was placed into the mixture one drop at a time with an eye dropper at about 0.044 mL of water a drop, until the grape was floating in the middle of the beaker. The number of drops that it took to suspend the grape was recorded as well. At the end of the experiment, the final density of the solution was calculated.

RESULTS

Amount of salt added to the water Number of pinches Grams of

However, since the density of salt is at 2.17 g/mL, when salt was added little by little, the grape slowly began to rise until it was floating at the top of the mixture, meaning that the density of the water had drastically risen. As was mentioned in the introduction paragraph, salt makes objects and substances denser, as is what happens in the Dead Sea, which has a density of 1.24 g/mL, thus allowing humans, with a density of only 0.985 g/mL, to float. After the grape began to float, water was added through an eye dropper until the grape became suspended in the middle of the mixture, meaning that the densities of the grape and saltwater had been equaled out. The final density of the solution of 1.07g/mL was calculated using the amount of water in the beaker, the amount of water added later on, and the amount of salt added to the solution. Obviously then, the density of the grape is 1.07 g/mL as well since they have equal density because of the fact that the grape was able to float in the middle of the