When given an unknown substance, there are only a few ways to determine what it is. The task for our lab was to determine the density of water and compare our recordings to the actual density of water listed in our lab packet. Then we were to find the density of an unknown liquid and find out what the substance was by matching its density with densities of substances listed in our packet.

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To find the waters mass, we first weighed an empty erlenmyer flask and rubber stopper. The erlenmyer flask was then filled with about 30 ml of deionized water dispensed from a buret. The flask and rubber stopper were reweighed, and the difference between the intial and final masses was the mass of the water. In order to find the volume of the water, i took note of the starting point of the water in the buret, then took note of the ending point of the water after about 30 ml were into the flask. Actual density of 2 propanol at 20 °c: 0.786 g/ml in order to find the mass of the water and unknown, a simple subtraction problem was used.

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I simply subtracted the mass of the empty flask and rubber stopper from the mass of the full flask and rubber stopper. I subtracted the intial amount of liquid in the buret from the final amount of liquid in the buret. In order to find the density, i simply divided the mass found by the volume found. To find the average density, i added the three densities i found, then divided that total by three to find the average. The equation for the water was 0.9861 g/ml + 0.9958 g/ml + 0.9650 g/ml / 3 0.9823 g/ml. Precision was found by taking the absolute value of the highest density minus the lowest density, dividing that difference by the average density, and then multiplying that answer by 10. For example, the precision for the water was found by this equation: 0.9958 g/ml 0.9650 g/ml / 0.9823 g/ml x 10.

Finally to find the error, i found the absoulte value of my measured density minus the actual density. With my data, my equation for the water was 0.9823 g/ml 0.99834 g/ml 0.01604 g/ml. A precision of 31.3544 ppt is a lot higher than 4 ppt, which is what is typically required to make sure my measurements were precise. My precision was 1.6632 ppt, which is well under 4 ppt which is typically required.

A few drops of the liquid inside seemed to drip out from right above the bottom where it was supposed to come out. Also, i may have gotten finger prints on the flask, which would have added a slight bit of extra weight that could throw my calculations off. Lastly, the density given for my unknown was listed at 20 °c, but i measured the room temperature to be 19.5 °c. For the water, i took the average of the density of water at 19 °c and 20 °c to find its density at 19.5 °c, but that may be incorrect if the density follows a curve. In the end, my data was fairly accurate with the actual data, so the experment was a success.

My results showed that density is really equal to a substances mass divided by its volume. Measurements in science: mass, volume, and density the purpose of this experiment is find the density of two metals using their mass and volume. Introduction: the purpose of the experiment that was conducted was to measure and calculate the density of two different metals. To calculate the density of metals the experimenters had to find out the mass and volume of each and then use the following formula: d m/v. M or mass is the amount of matter that an object contains and it can be measured using a balance. Determine their volume in the following way: place 75 80 ml of water in a 100ml graduated cylinder.