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# How does density of a liquid affect the volume of its drop

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Introduction

How does the Density of a Liquid affect the Volume of a Drop Background Research: A drop is formed because liquids have surface tension. Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with gas, acts like a thin elastic sheet. This term is typically used only when the liquid surface is in contact with gas (such as the air). Surface tension causes a drop of liquid to hold together due to the strong bonds between the molecules. Drops form when liquid accumulates at the lower end of a tube or other surface boundary, producing a hanging drop. Droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. Aim To investigate how the density of a liquid affects the volume of a drop of that liquid. Hypothesis As density increases, the volume will increase due to an increase in surface tension. This is because the denser a liquid is, there is a greater cohesive bonding between particles so there will be a larger volume in the drop Materials: � � Glass pipette (25cm3) ...read more.

Middle

goggles � � Do not ingest any of the liquids used in this experiment � � Make sure that the hydrochloric acid doesn't come into contact with skin since it is corrosive. � � Handle the glassware carefully Data Collection Table 1: Number of drops of each liquid to fill 25 ml Liquid Number of drops needed to fill 25ml�0.1 Milk 480 Vegetable oil 688 Vinegar 508 Distilled water 426 Hydrochloric acid 408 Data Processing Volume of liquid in the cylinder Number of drops Calculations Milk: 25/480 =0.052 cm3 Vegetable Oil: 25/688 =0.036cm3 Vinegar: 25/508 = 0.049cm3 Distilled water: 25/426 = 0.058 cm3 Hydrochloric acid: 25/408 = 0.061 cm3 Type of liquid Density (g/cm3) Volume of a drop(cm3) Vegetable oil 0.91 0.036 Distilled water 1.00 0.058 Vinegar 1.01 0.049 Milk 1.03 0.052 Hydrochloric acid 1.19 0.061 Table 2: The volume of a drop of liquid x and the density of liquid x Graph 1: Graph of Density Vs. Volume of a Drop Data Analysis It can be seen that the volume of a drop does generally increase with the increasing density because the points rise from 0.036cm3 to 0.061cm3. ...read more.

Conclusion

the results obtained might have been affected by a changing temperature which was not accounted for � � Because we didn't consider the concentration of the milk, it may have been the root cause of the anomaly in our results. � � Since the concentration of the ethanoic acid in vinegar was not considered, it also caused one of the anomalies because concentration would effect the density of a liquid � � Carry out the experiment again but keep the temperature controlled. This could be done by keeping it in a room with an unvarying temperature and this could be enforced by taking the temperature of the liquid dropped at a time interval � � Carry out the experiment again but use a specific concentration of milk (something equivalent to 2 mol) so the value for the volume for a drop of milk would fit into the smooth curve and not come up as an anomaly � � Carry out the experiment again but use 2mol dm3 concentration of vinegar (so it is equivalent to HCl). This would aid in setting the point for milk into the smooth curve and minimize errors. ...read more.

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