# How to write a lab report on density

What could be done to improve the precision in any or all of the methods?

### Mass and volume measurement lab report

Tilt the graduated cylinder and allow the pellets to gently slide to the bottom. Compare the three methods used to determine volume - which method was more accurate and why? The method used for determining the density of a substance depends on the nature of the substance. Record the volume to the nearest 0. Version Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. This results to a decrease in density [1]. How does the instrument error compare to standard deviation error? The water became cloudy when we put our pieces into it.

The zinc was cylindrical in shape we used the rods. You must use the correct calibration result with the appropriate data.

## Density of unknown metal lab report

Balance and record the mass of the filled viscometer plus the stopper. I then determined the density of the solution by taking the mass of solution and dividing it by the volume of solution. The balance was not tared when we took our measurements equipment error. Density also does depend on temperature. This is because if there is no mass, the volume must also be zero. Finally, look up the true density of water at the temperature used, and evaluate the accuracy of your average density value by calculating your percent error. Your unknown material is one of the substances listed in the table below. The overall effect of these errors was an increase in the density from the expected value. The displacement method is used to determine the volume of both types, even though the rods could be determined mathematically.

At temperatures higher or lower than ICC, its density slowly decreases. Repeating the procedure twice more using a clean flask and the same balance each time.

We did not read the graduated cylinder at eye level random error. Convert this mass to volume units by dividing by the density of water use a precise value, specific to the water's temperature. Find the uncertainity using error propagation. The transition of molecules of matter to a less random form, say from gas to liquid or from liquid to solid, causes a drastic increase in the density.

The pycnometer containing the metal cylinder with water filled to the mark is called 'B'. I turned the knob of the buret and put approximately Error Analysis: The possible sources of error in finding the density of the unknown metal and liquid would have to be my consistency throughout the experiment.

## Density determination lab report discussion

Assume that the density of water makes a negligible contribution to the overall uncertainty in the values calculated. Calculations: For each of the three trials I calculated the density of the solution and determined the mean, average deviation from the mean, percent precision and the range. Replace all the objects in the tube and return the tube to your instructor. The experiment approach that will be used will tell the mass and volume of the metal and liquid determined by measuring these two quantities with a graduated cylinder and biuret. How does the instrument error compare to standard deviation error? Analysis: Subtract the mass of the empty cylinder from each combined mass measurement to obtain three mass measurements of water. Related Interests. The zinc was silver-gray in color. From the table provided, I identified the unknown metal to be silver. Ideally, the metal would identify more comparably with gold or aluminum. Again, start with the smallest object first and progress in order of increasing object size. Analysis: Use these measurements along with the density of aluminum to calculate the thickness of the foil. I added the metal to the graduated cylinder until the water level increased by approximately 2.

Which was most precise? Please do not throw the metal cylinders away.

### Density lab abstract

Add another mL of distilled water to the graduated cylinder. Calculate the uncertainty in the mass of water removed using error propagation. The density for the zinc pieces in our experiment was 7. Record the new volume. Carefully clean and dry the viscometer. Beaker, ml E. Procedure Part A In Part A, The main purpose was to find the determination of the density of the unknown j41 and by doing that we had to determine volumes of the unknown liquid j41 using three different volumetric devices which are graduated cylinder, pipette. Use the ruler to measure the length and width of the piece of foil. Volume of water before adding metal Density also does depend on temperature. Tossing it in can break the bottom of the graduated cylinder. The statistical values for the rods were much more accurate and precise than the values for the pieces.

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