1- 800 mL of raw water was transferred to six beakers using a measuring cylinder and a marker was used to assign different numbers to each beaker. 2- To make sure the pH was varied during the first part of the experiment, the pH in each beaker was adjusted. Using Hydrochloric Acid and Sodium Hydroxide, the pH of the six beakers was adjusted as follows: pH 3, pH 4, pH 5, pH 6, pH 7, and pH 8. However, the pH does not need to be exact. 3- Next, add 3 mL of Ferric Chloride coagulant using cylinder tubes and 3 mL of Aluminium Sulphate to the beakers. Place the six beakers on the Flocculation apparatus and mix rapidly for one minute and slowly for fifteen minutes. Measure the time using a stopwatch and allow for another fifteen minutes to settle. 4- …show more content…
Using a dropper, take out some of the Supernatant liquid from each beaker and measure the turbidity. The lower the value of the turbidity, the more effective it is. 5- Next, filter some other samples that were taken out from the beakers using 0.5 insert unit m filter paper, a flask, and a pump. The pump sucks all the air from inside the flask in order for the filtered water to come down the filter paper. The filtered water is then placed in a cuvette to measure the absorbance at 455 nm. The lower the absorbance, the better it
In the first part of the experiment, Part A, the standard solutions were prepared. As a whole, the experiment was conducted by four people, however, for Part A, the group was split in two to prepare the two different solutions. Calibrations curves were created for the standard solutions of both Red 40 and Blue 1. Each solution was treated with a serial 2-fold dilution to gain different concentrations of each solution.
Objectives In this lab, you will investigate the percent composition by mass of CO2 in Alka-Seltzer® tablets. In addition, you will find out how much CO2 is released into the atmosphere as 2 Alka-Seltzer® tablets chemically react in vinegar. Procedure 250-mL beaker 100-mL graduated cylinder Scale 60 mL of Vinegar 2 Alka-Seltzer® tablets
1. A number of different items were measured in this lab. For each of the following items, what did you find most challenging in making the measurement and how did that challenge affect the accuracy of the measurement? a) Length of the table b) Height of your partner c) Thickness of your finger
In the experiment they used probes to test for pH, dissolved oxygen, total dissolved solids, conductivity, and turbidity. The probes hook up to the computer and collected the averages for each test. They collected this data and used it for later evaluation of the contaminates. They also tested for iron, copper, and chlorine with different tablets.
Whereas, the initial pH of Buffer #2 before titrated with NaOH was 3.851 and was 3.806 before titrated with HCl. This pH is close to the assigned pH of 4. However, the pH of the buffer was not exact because the concentration of the stock solutions may not be accurate. Although the calculations could have been correct, the mixture of the stock solutions would not give our exact desire pH. The pH of the buffer was closest to 4 during the 1st titration with NaOH. However, during the last 3 titrations, the initial pH of the buffers were much less than 4.
Introduction The purpose of this lab was to compare galvanizing and creating brass with pennies using weight change, mass change and observations. The independent variables are the types of pennies used. The dependent variables are the characteristics, change in pennies, and mass of the pennies.
3. Upon adding 20 drops of NaOH, a white precipitate was formed signifying acidic impurity. In the second NaOH mixture, about 20 drops were administered and no precipitate formed indicating that the ample is more pure than before. Data: Weight of flask = 75.10 grams Weight of the flask with solids =
Introduction: In this assignment, I will be doing two experimentations on examining the impact of temperature on the Alka-Seltzer’s response time. The first experimentation that I will be doing involves some water that is room temperature. The second experimentation that I will be doing involves some water that is very hot. If I want to be able to figure out the impact of the temperature on water, I will have to document the time it will take for the Alka-Seltzer to go into solution.
Synopsis This laboratory report gives an outline of the experiment which was carried out in order to measure the density of water at different temperatures via two different methods. The lab consisted of two parts. In the first part the density of water was measured by hydrometer. At first the density of water at room temperature was measured.
Materials and Methods The chemicals used to perform this experiment were distilled water, sodium chloride (NaCl), ice,
Pat McGurrin October 24, 2015 Period #1 Honors Biology Mr. Dinunzio Murder and Meal Lab Analysis Procedure: 1.) Gather all materials: Safety goggles, 250ml beaker, water, hot-plate, test-tubes, paper bag tear, stomach contents, pipette, Biruet solution, Benedict’s solution, and Iodine solution. 2.) Put on safety glasses.
The observed emission data for the different elements did not look how they were supposed to. However the “peaks” for Hydrogen were found to be 534.52 and 631.24, 534.70 and 569.11 for Helium and 529.73 and 630.71 for Mercury. The Rydberg’s Constant found to 1.1x107 8.5x104 while the known constant is 10967758.34m-1. The percent error of 0.29% and the accuracy of this reading is 99.7. The slope and intercept of the linear regression line is -0.01 3.3x10-5 and 0.02x10-1 1.9x10-6 respectfully.
Practical I: Acid-base equilibrium & pH of solutions Aims/Objectives: 1. To determine the pH range where the indicator changes colour. 2. To identify the suitable indicators for different titrations. 3.
Two 50-mL Burettes 10. Two Small funnels so that they fit into the burettes 11. Drop counter 12. LabPro unit 13. A Computer with pH electrode 14.
The chemical equation for this experiment is hydrochloric acid + sodium thiosulphate + deionised water (ranging from 25ml to 0ml in 5ml intervals) sodium chloride + deionised water (ranging from 25ml to 0ml in 5ml intervals) + sulphur dioxide + sulphur. As a scientific equation, this would be written out as, NA2S2O3 + 2HCL + H2O (ranging from 25ml to 0ml in