- 1). Set the balance to zero. A triple-beam balance is zeroed by setting the sliding weights to read zero with the pan empty and then observing the balance mark. If the balance mark is off, then use the zero adjust knob located beneath the pan to adjust the balance mark so that it reads level.
- 2). Measure the mass of an empty graduated cylinder. Record the mass of the empty graduated cylinder.
- 3). Use the graduated cylinder to measure a volume of liquid. Record the volume of the substance.
- 4). Measure the mass of the graduated cylinder containing a known volume of the liquid. Record the mass of the graduated cylinder and liquid.
- 5). Subtract the mass of the empty graduated cylinder from the mass of the graduated cylinder containing the liquid to determine the mass of just the liquid. (Mass of liquid = mass of full cylinder - mass of empty cylinder).
- 6). Calculate the density of the substance by dividing the mass by the volume (density = mass/volume).
- 7). Repeat the experiment for different masses or volumes of the same liquid. The density should calculate the same in each case. Errors are likely the result of poor measurement.
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