How accuracy may be ensured in techniques used

direction from where you can read them. The vials should not be shifted during the experiment and your

For this lab we used two techniques which were the water displacement technique and filling a pipet all the way up 1. For the water displacement technique you need to first fill the graduated cylinder to an approximate measuring point. Then, you tilt the graduated cylinder and place the solid into the graduated cylinder. Finally, subtract the measurement with the solid in it to the starting place of the liquid 2. To fill a pipet all the way up you first need to place the pipet in the liquid and let go of the tip to let it fill up.

During the experiment some questions came up such as: How much does the data really affect the results? Why did the results have a certain percentage error? Will the results bring new questions to light?. The methods used to calculate the results were done both by doing the experiment and by searching the vast knowledge of the web. Some major findings were the correlation between density, volume, and mass, and how all of them can be used in different ways to figure the output of one another. The results were not accurate the first time due to experimental error, but with a few minor modifications the desired result was found. Probably the biggest challenge faced during the experiment was the different

The instruments used in this experiment is an analytical balance to ensure precision. In order to

After that I will fill my measuring cylinder with water in my bowl of water, making sure there is no bubbles in the tube and then turn it upside down (as shown in the last page)

3. If the measurement 2.86 has an uncertainty of ± .04, what is the range that the true value of this measurement can fall in, written in the form of x≤true value≤y.

Introduction: ¶ 1 (Background, general) Living organisms need energy in order to develop, and reproduce. If organisms don’t get the essential energy needed it can lead to energy deficiency. Which can lead to many problems with the organism and with population and ecosystem levels as well. Organisms have a metabolism which manage the material and energy resources of the organism.

A ring stand with the buret was set up, and then a large waste beaker was placed under the buret. The buret was rinsed with distilled water. A clean 150mL beaker was used to obtain approximately 100mL of 0.0474 M NaOH solution. The buret was rinsed by sodium hydroxide. The buret was filled with sodium hydroxide by a clean funnel. The funnel was removed, and the stopcock was opened for a short time. The level of the solution was lowered. The leaking was checked, and then the initial volume of sodium hydroxide solution was recorded. The carbonic acid in the soda was previously removed by boiling. Prior to each

2. Add 4 drops of indicator into the flask and titrate to the first permanent appearance of pink. Near the endpoint, add the NaOH dropwise to

Observation is an important tool, and one that is used on a daily basis by all people. Observation in the scientific method is used to first identify an issue, in the next step patterns and regularities are identified. The strength of recognizing patterns and regularities is that once recognized and identified a pattern or regularity can often be manipulated in order to change the results. Prior to manipulating the pattern that a person has recognized they should follow the third step of the scientific method and perform research. Research may show that experiments have been tried in the set of circumstances a person is observing, and may render some options as having previously failed or previously rendering a particular set of results. The last steps are creating a theory, predicting the results, and testing that theory. There is an optional fifth step of reporting the results that is used by professional scientists and students, but often is not necessary in daily life. (Trefil & Hazen,

Check the calibration of the turbidimeter periodically. Use an appropriate turbidity standard (85% T or 65% T) and operating properly. Then, use a cotton-tipped swab to pick up a 3 mm diameter area of cell growth from the surface of the agar plate. Grasp the swab at its tip and, holding the swab vertically, touch it to the cell growth. For fast growing bacteria, touch a single colony,

Percent error for the measurement of the locker door was not calculated because the standard values for the part of the locker measured were not available: the door of the locker was measured and the standard value was for the door and its trim. Percent error for the table

Good laboratory practices follows, checking the equipment and familiarising yourself with all the components that you will use in your experiment. We undertook this by following ‘figure 4’ in the laboratory manual.

In order to have a great experiment and receive valid results, consistency and being able to maintain an order of methods and having alike testing subjects will produce greater results. It is important to follow procedures step by step, any mistake or any misplaced data will create a flaw on overall experiment. No data should be left out or ignored on the process of completing the experiment, every note and change is essential for the experiment. Leaving information half way or forgotten will confuse other researchers that try to duplicate or understand the experiment. If procedure is followed correctly, the chances for another duplication of the experiment can be made and the results will be successful.

1. In volumetric analysis, the volume of a reagent needed to react with analyte is measured.