Labratory Techniques and Measurments

Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a variety of items using common laboratory measurement devices, to learn to combine units to determine density and concentration, and to use laboratory equipment to create serial dilutions and determine the density and concentration of each dilution.

Purpose: To become familiar with the International System of Units and common laboratory equipment and techniques. To learn how to determine volume, mass, length, and temperature of a wide variety of items. To learn how to calculate density and concentration of dilutions.

H. How would you prepare 10 mL of a 0.25M HCl solution if 1M HCl was available? How much

There are several sources of error to this experiment due to random and systematic errors. The only source of random error was the measurement that we took through the graduated cylinder which was only accurate to the nearest 1%. We took the largest error from this one percent, which was +/- 3. The largest relative error this yielded was only 3%, so this did not affect how precise this experiment was too much. We can still make this more precise by making the masses of the water larger. For example if we started the masses at 300mL and went up by 50mL, the largest error this would yield would be 2% due to the largest error being +/- 5. This would cause smaller errors in the amount of water.

A. Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?

3. The volume of a fixed mass of a liquid sample increases as the temperature rises from 20 to

b.) If all three of these liquids were added to the same flask, they would separate in the following

56.78 g 60.33 g 56.78 g Initial measurement of water in the graduated cylinder 60.7 mL 62.3 mL 58.5 mL 57.2 mL Measurement of the graduated cylinder after metal #8 is added 67.3 mL 68.9 mL 65.3 mL 64.1 mL Volume 6.6 mL 6.6 mL 6.8 mL 6.9 mL Density 9.1 g/mL 8.6 g/mL 8.9 g/mL 8.2 g/mL IV. Calculations: 96.3 mL of water were in the Styrofoam cup.

The difference in the measurement was 0.1 centimeters, one millimeter, or 0.001 meters. A factor that could account for this difference is that when we measured using the metric ruler, we had to constantly move the ruler down the table in order to obtain the full measurement. During the process of doing that, it is very possible, that a millimeter or two could have been added or cut off while we were continuously moving the ruler. In station two, the directions stated not to splash any water out of the graduated cylinder when we put the rock in because it would alter the results for the measurement. For example, if a few milliliters of water spilled out while placing the rock in, the calculation for the measurement of the rock would also be a few millimeters less; therefore, it would decrease the accuracy of the measurement of the volume of the rock.

During my experiment I 've learned a fairly great deal about temperatures, and how to convert Celsius, Fahrenheit, and Kelvin. In my observation I have learned that water boils at 100 degree Celsius, and freezes at 0 degree Celsius.

    For question (2) he again used mental math and came to the conclusion that it was 4 feet/ounce of water. His rationale was the same as for (1b), to get back down to the base height. At this point, it

When measuring the cool tap water in the second part of this experiment, the alcohol thermometer presented a reading of 60.8 F (16 C) and the Proven thermometer produced a reading of 63.1 F (16.3 C). There was not a huge difference between the two readings, given that one is meant to read the infrared wavelengths of the human body.

* Use thermometer to measure the temperature of the water in the beaker using Celsius unit. Record measurement in Data Below.

For my Senior Project, I am submitting a lab which I completed in AP Chemistry. In the Gravimetric Analysis of Calcium and Hard Water Lab my lab partner and I conducted an experiment in which we calculated the mass of the precipitate formed by the mass of the isolated analyte present in the reactants before the reaction. During our experiment, we used resources such as graduated cylinders, sodium carbonate, bunsen burners, an analytical balance, watch glass, filter paper, a funnel, tongs, and an oven. The lab equipment allowed us to effectively precise measurements of water hardness. For example, the analytical balance gave us a more precise measurement than a triple beam balance would. The temperature of the burners as well as the temperature

The second method (water displacement method) would work for both regular and irregular shapes because you would have to know or find out the volume of the regular shape to get the volume for the irregular shape. If you are doing a regular shape then use the first method, if it's an irregular shape then use the second method, if you do the maths correctly both should give you an accurate answer for what you want to achieve. The displacement method of measurement would not work for a cube of sugar because the sugar would dissolve. The displacement method also wouldnt work on cork in this case because of the weight