Correlation Between Accuracy And Precision

Procedure: Measure the volume, mass, length and temperature of a variety of items. Create dilution of sugar water.

Procedure: I used a ruler, thermometer, and scale to take measurements. I used a graduated cylinder, short step pipet, scale, and ruler to determine volume and density. I used a volumetric flask, graduated pipet, pipet bulb, scale, and glass beaker to determine concentrations and densities of various dilutions.

The purpose of this lab was to determine the limiting reactant in a mixture of to soluble salts and the percent composition of each substance in a salt mixture.

In the ADI Molarity Lab, the primary tasks was to use different values of moles of solute, volume of solvent, and molarity to find the mathematical relationships between them. To find these relationships, our group had to change the quantities of each of the variables and visually observe the molarity within the solution. For instance when using Cobalt (II) Nitrate to find the relationship between volume of the solution and the molarity of the solution; the group kept the amount of moles of the solute at a constant of 1.00 moles because if it would have changed it would have caused inaccurate data. We first set the volume of the solution to 0.2 liters. The molarity of the solution was 5.00 mol/L. Then we changed the volume of the solution

The results showed the molarity of the NaOH solution. This experiment was completed twice and a new average molarity

Abstract: The objective of the lab is to determine the volumes of the polystyrene spheres with three different measuring tools: Water Displacement, Analytical Scale, and Triple Beam Balance Scale. The experiment is meant to help understand the concept and application of precision and accuracy in experimental measurements. Accuracy is a measure of how closely the results of repeated measurements are to the true value of what is being measured. Precision is the variability in the results from the repeated measurements, and how close the repeated measurements were to one another. In this lab, the method for measuring the volume of the polystyrene spheres is done with the previously stated tools: Water Displacement, Analytical Scale, and Triple Beam Balance Scale. The standard deviation for the entire classes volumes and masses are recorded to determine the densities.

The wet, crude product was placed into the 50 mL Erlenmeyer flask. Small amounts of CaCl2 were added to dry the solution. The flask was sealed and the mixture was swirled and left to settle. Once

Abstract: This experiment introduced the student to lab techniques and measurements. It started with measuring length. An example of this would be the length of a nickel, which is 2cm. The next part of the experiment was measuring temperature. I found that water boils around 95ºC at 6600ft. Ice also has a significant effect on the temperature of water from the tap. Ice dropped the temperature about 15ºC. Volumetric measurements were the basis of the 3rd part of the experiment. It was displayed during this experiment that a pipet holds about 4mL and that there are approximately 27 drops/mL from a short stem pipet. Part 4 introduced the student to measuring

To achieve a good volumetric technique, the experimenter needs to be able to correctly complete certain procedures.

The volume of a small test tube and a thin-stemmed pipet were determined in this section of the lab. Water was poured into a small test tube until the water reached the very top edge of the test tube. The test tube was then emptied into a plastic 25 mL graduated cylinder and volume was measured and recorded into data table 3. A think-stemmed pipet was completely filled with water. Drops were carefully counted and emptied into the empty plastic 25 mL graduated cylinder until the water level reached 1 mL. The number of drops in 1 mL was recorded into data table 3. The thin-stemmed pipet had a total volume of 4 mL and that was also recorded into data table 3.

Sample A was identified as Diet Coke, while Sample B was Regular Coke. For precision, mass measurements were more precise. They were more precise because the scale used for the measurements gave four significant figures whereas the graduated cylinder only had three significant figures. For Sample A, the average calculated % error was -7.77%. Trial 2 was the most accurate because when calculated, its % error came out as -6.45%. For Sample B, the average calculated % error was -.9213%. Trial 1 was the most accurate because when calculated, the % error was -.9597%. Sample A’s average measurement for density (.920g/mL) was closely related to Diet Coke’s density which was .997g/mL. Whereas Sample B’s average measurement for density (1.03g/mL)

The purpose of this experiment was to use different statistical tools to compare and contrast their measure quantities. We conducted our experiment to see which of the three measuring devices, pipette, beaker or buret, was the most accurate device to measure water. We concluded that the pipet is the most accurate measuring device because the class data contained a relative standard deviation of 6.49% for the pipet, which is lower than both the beaker, at 13.98%, and the buret, at 7.97%. On our data points for each of the three measurement devices, we did not have any outliers based on the Q test. Our data did not compare well with the class data. Our 95% confidence aspect of the data compared well within a few tenths with each measurement device, but the % error, standard

The volumetric pipet was the most accurate and precise, while the Erlenmeyer flask was the least accurate and the least precise. The graduated cylinder was much more accurate than the Erlenmeyer flask, but not quite as accurate as the volumetric pipet. In part two, 5mL of water and 5mL of isopropyl alcohol were mixed in attempt in attempt to answer the question ‘are the volumes of two pure substances additive?’ According to our data, no, they are not additive. When mixed, the results consistently came up at least .08mL shorter than what was

In this experiment, accuracy and precision were measured through the density of water (H2O). Accuracy is defined by how close the result comes to the true value. Precision refers to how close two or more measurement are to each other. A volumetric flask, graduated cylinder, pipet, and buret were used to measure the water. A balance was used to measure the grams of each trail.

Figure 3 gives the average sweetness score with error bars (n=64) for samples 565 (experiment 3) and sample 401 (experiment 4).