Purpose: The purpose of this lab is to titrate an unknown solid acid (KH2PO4) with a standardized sodium hydroxide solution. After recording and plotting the data, the acid’s equivalence point will be recorded once the color changes. Using the equivalence point, the halfway point will be calculated, which is used to determine the acid’s equilibrium constant. The acid’s calculated equilibrium constant will be compared with the acid’s established pKa value. Eventually using the NaOH and the acid’s consumed moles, the equivalent mass will be determined.
Knowing the Interrelationship Between the Consolidation of Sodium Chloride Mixtures and Their Densities Chemistry 1A Lab 5pm Th, Department of Chemistry, California State University Fresno Professor Nimavat Experiment Conducted: 1/25/18 Report Submitted: February 15th, 2018 Alex Luna* and Ellen Introduction: Density is defined as the ratio between mass and volume or mass per unit volume. It is a measure of how much stuff an object has in a unit volume. This report discusses an experiment to find out if there is a correlation between a salt solutions concentration and its density. Conduct 3 separate trials and take data measurements to determine the density of each salt solution. Determine the best procedure for measuring density (Beaker,
The experiment began by setting up the LabQuest and preparing a 2M solution of HCl and a 2M solution of NaOH. This was called “Part A”. Two general rules were noted throughout the experiment: add acid to water and pour stock solution into beaker before graduated cylinder. This prevented flash-boiling of the solution, chemical burns, and spills. To make the 2M HCl solution, 200mL deionized water was added to a 600mL beaker labelled “2M HCl” by using a graduated cylinder.
Introduction The purpose of this experiment was to identify the composition of over-the-counter analgesics by the method of Thin Layer Chromatography (TLC). The TLC method is used for rapid qualitative analysis of mixtures to determine and identify its components and purity. A development solvent was used to separate the analgesics found in both the known drug sample and an unknown sample of over-the-counter medications. The pertinent techniques for this experiment are spotting the stationary phase with the samples, placement of stationary sample in mobile phase chamber for development, observation under a UV light, and further development in iodine chamber. Experimental Scheme Figure 1 Figure 2 Anacin Salicylamide Procedure 12 micropipettes were prepared in lab by heating the middle of capillary tubes over a flame.
We’re supposed to record the color and texture. For the water test, we would have to stir and mix it with the foot powder. Next we would mix the foot power with vinegar and look for a gas production. After you would do the same to iodine with foot powder, but look for either a dark purple or blackish color after dropping iodine in the foot powder. Finally, you would do the heat test which
I tested Daphnias in a different environment with some high concentration of chemicals. The different environment experiment which included the ethanol, caffeine and spring water. Firstly, I used a transfer pipettes to grab a daphnia from its original habitat. Using a glass side on the microscope, I transferred the daphnia in the pipette to the glass slide. Adding 5% of ethanol to the slide enabled me to figure out how the Daphnia will act in that environment.
Substrate concentration basically means the amount used for the substrate. The substrate in our experiment was 0.1% hydrogen peroxide. The 0.1% is the concentration amount. Just like temperature and pH, substrate concentration can speed the reaction only up to a certain limit. When we mixed pH 3 enzyme tube with substrate tube, we used 0.3 mL of hydrogen peroxide, but if we were to increase the amount, then the experiment would have been faster.
In this experiment, method 1 generate a mixture of yellowish crystals and a yellowish gluey product. Using method 2, the product appear as white crystals. Given that the yellow color remain throughout the product in method 2, too much aldehyde was added. It was predicted that this was the source of error because aldehyde was a yellow liquid. In this experiment, 293 mg of aldehyde was weighted for method 1 instead of 250 mg and.
Which reactant is the limiting reactant along the upward sloping line of your graph? Which reactant is the limiting reactant along the downward sloping line? Explain how you made this determination. Sodium hypochlorite is the limiting reactant along the upward sloping line and Solution B is the limiting reactant along the downward sloping line. I made this determination by looking at the graph; NaClO is the limiting reactant, as the best-fit line rises you can see that all of it gets used up as it makes the incline.
Start the titration and keep titrating in 0.5ml intervals until the graph shows the end point. Transfer the data from the LabQuest to a computer using a USB key and then open the file to select the values which is used to obtain the graph below. Pipette 20ml of the phosphoric acid into an Erlenmeyer flask and add 3 drops of Thymol blue indicator. Perform a titration using NaOH solution. Repeat the experiment.
All things considered, the results proved that the unknown substance or element was barium since the calculated density was 3.9 g/mL. To expand upon, the density was calculated by measuring the mass of the metal and using the displacement method to determine the volume of the metal. Also, the best method of disposing the storm water would be to contact a Wastewater Treatment Plant (WWTP) so that they could put it through a purification process, making all that water reusable. Meanwhile, the percent of recovery was calculated by the formula Percent Recovery=observed valuetrue value *100%. Furthermore, according to the pie chart created in the data analysis, the sample given contained of the percent by mass for metal to be 5.2%, salt was 3.3%, wood was 3.1%, plastic was 4.5%, rock was 12.5%, sand was 11.8%, and water was 59.6%.