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screwanchorlab

# screwanchorlab - alcohol In reality the volumes of the two...

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Density of Plastic Screw Anchors Problem: Determine the density of the plastic object experimentally. No balance may be used in the procedure. Given: Density of water is 1g/ml Density of an isopropyl alcohol solution is 0.85 g/ml ( should use 70% isopropyl which is what is sold at stores) Equipment graduated cylinders beral-type pipets beakers test tubes plastic screw anchors Solution: Put the screw anchor in either alcohol or water. Add the other while stirring until the object floats in the solution and does not move to the top or the bottom. Calculation: Suppose in the experiment it took 10 ml of water and 15 ml of
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Unformatted text preview: alcohol. In reality, the volumes of the two are not additive. In other words, the final volume will not be exactly 25 ml, but for our purposes let’s assume that the volumes are additive. This will only cause a very small error. D = M / V so M = D X V Density of the object = Mass of the solution / volume of the solution Density of the object = (M water X D of water)(M of alcohol X D alcohol) / V total Density of Object = ( 10ml)(1g/ml) + (15ml)(0.85g/ml) / 25ml = 0.91 g/ml...
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