Chem 1211K Lab Report Essay

We know that that the end point of the titration is reached when, after drop after careful drop of NaOH, the solution in the flask retains its pale pink color while swirling for about 30

1. To prepare a standard solution of oxalic acid and use it to standardize an unknown  sodium hydroxide solution.

After each of the solids were completely dry, each was placed into a MelTemp device. The temperature at which each solid began to melt and completed melting was recorded.

a. Change the 24th bead to a different color. What does the sentence say now (re-read the entire sentence)? Does the sentence still make sense?

After the twenty minutes elapsed, the flask was cooled to room temperature and then titrated with the remaining NaOH until the colorless solution remained pink. The final volume was then recorded. While solution #1 was heating the same process was repeated with solution#2 and the second burette

end rex_A = 0.0003869* exp(-0.00007921*rex_Q); % Q exponent rex_D_H = rex_D * 0.8; rex_Q_H = rex_Q * 0.98; rex_D_L = rex_D * 1.2; rex_Q_L = rex_Q * 1.03; % Calculate k and convert time steps to time in seconds for plotting results k = T/N; % Duration of each t-step timescale = transpose(0:k:T); % Zone length and number of division data zone_length = zeros(20,1); zone_sections = zeros(20,1); zone_length(1) = 5.395; zone_length(2) = 5.461; zone_length(3) = 5.461; zone_length(4) = 5.461; zone_length(5)

After copying the freecell.exe file from another computer, I had to deal with a typical form of fault message simply after

Students will receive direct instruction during a lab which covers the different parts of a microscope, and the functions that each part cover. After direct instruction, the teacher will model how each part of the microscope functions, after which the students will discuss among small groups how the microscope works, then demonstrate within small groups how to use a microscope. During this time, the teacher will move around the student lab stations and assist students in further understanding of the functions of a microscope.

Discussion: As seen in the melting point determination, the average melting point range of the product was 172.2-185.3ºC. The melting points of the possible products are listed as 101ºC for o-methoxybenzoic acid, 110ºC for m- methoxybenzoic acid, and 185ºC for p- methoxybenzoic acid. As the melting point of the sample

Identifying this organic acid was an extensive task that involved several different experiments. Firstly, the melting point had to be determined. Since melting point can be determined to an almost exact degree, finding a close melting point of the specific unknown can accurately point to the identification of the acid. In this case the best melting point

Melting range would be closely related to a mixed sample whose constituents are most identical. In other words, melting point will have a wide range and would be below 200°C and above 95°C.

Kevin Malakov 6/28/15 CHM 3001 Professor Charnick Lab #7: pH, Dissociation, Hydrolysis, and Buffers
Lab Abstract: The purpose of this experiment was to “compare calculated and measured pHs of a series of hydrochloric acid and acetic acid solutions.” “Measure the pH of various salt solutions.”

Titration can be used to standardize a solution. In this experiment, sodium hydroxide was used to titrate KHP solution. Using the results of the titration, the exact concentration of NaOH was calculated to three significant figures. As see in data table A.1, the volume of NaOH used in trial one is 25.95 mL, and moles of KHP is 0.003501 mol. Using this information, the molarity of NaOH was found by using the formula, Mass of sample x (1 mole/ atomic mass), in Table A.2.

The half life of 90Sr is 29 years.  What fraction of the atoms in a sample of 90Sr would remain 175 years later?

Conclusion: This lab is finding the molarity of NaOH by the titrating with HCl. The experimenter is dropping NaOH and when the solution’s color change, swirl the solution when it changes to transparent. By repeating this process, the experimenter finds the molarity of NaOH. At first trial, initial volume of NaOH was 37.00mL and we used 1.00mL for the titration and the final volume of NaOH was 38.00mL and the molarity of NaOH was 0.50M NaOH.