A hot plate was placed under the ring stand. 50 mL of 3.0 M NaOH in a 250 mL beaker and a stir bar was placed in the beaker. The beaker with NaOH was placed on the hot plate and 3.75 grams of NaAlO2*5H2O was placed in the beaker. The temperature probe was placed in the beaker with the solution, not touching the bottom of the beaker. The solution was heated and stirred till the solution dissolved.
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.
Introduction The purpose of this Lab was to identify the density of the unidentified object and determine what substance the unidentified object given by the teacher was. The density calculated in the experiment will stay the same because the density of the unidentified object will stay constant. The Independent Variable of this experiment was the calculated density and the unidentified object given. The Dependant Variable for this experiment was the density.
We are doing a gummy bear lab. Gummy bears come in different sizes, shapes, and colors. Gummy bears are squishy, chewy, and sticky, they are made of sugar which are glucose and glucose are carbohydrate. We predict that during this stage of lab the solute and solvent will go through the stages of hypertonic, hypotonic and isotonic. We get 4 gummy bears and 4 cups filled half way with different types of liquid, such as Salt-Water, Coffee-Creamer, Vinegar, and Soda.
Unknown Lab Report Unknown # 25 By: Jenna Riordan March 19, 2018 Bio 2843 1. Introduction Microbiology is the study of microorganisms found in all different environments throughout Earth, from the hot thermal vents at the bottom of the ocean to the ice at the top of a mountain.
Determining the Identity of an Unknown Diprotic Acid Through Titration Kevin S. Burton; Madison Gallegos April 2, 2018 Abstract There is more than a single way to determine the molar mass of a compound or element. Titration is one such way to determine molar mass by reacting an unknown compound or element with a known compound or element. In this experiment an unknown diprotic acid was combined with a known base, in this particular case, NaOH. As it was known to be diprotic, the unknown acid was to give two H+ ions in a chemical reaction with the known base.
Hi Dad How is it going? My first semester at the University of Michigan is very exciting. One of my favorite classes is the organic chemistry lab. It is completely different from the typical Orgo lab that you took at college. The instructors are trying to teach us the applications of chemistry in real life.
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.
The gummy bear's mass and volume will increase while the density of the gummy bear would decrease after it is put into water overnight. (#)This lab experimented to figure out wah changes would take to the gummy bear’s mass, volume, and density after sitting in a cup of water overnight. To do this the gummy bear's dimensions and weight was taken on the first day, along with its density and then the gummy bear was placed and water. When the gummy bear was taken out of the water on day two, the dimensions, weight, and density were taken again, and the difference between the two days was found. (#1)
Our data for the water treatment group showed no change in glucose (remained negative), little to no change in the protein, pH was around 6.5 after the ninety minutes and experience little change, while the specific gravity for each subject varied, some decreased, and others increased; the average was 1.000. For our glucose treatment group, there was no change in glucose (negative), no change in the protein, the average pH after the ninety minutes was around 6.9- each subject experience an increase or stayed the same, and lastly, the specific gravity was relatively constant around 1.010. For the last treatment group: salt there was no change in glucose (remained negative), no chance in protein, average pH after the ninety minutes was 7, and specific gravity was around 1.005. The pH changed for the salt groups which we expected to become more acidic and we expected the water group to be a more neutral; while there was no change in pH for the glucose and protein groups. The specific gravity of the salt group increased as expected, the water group experienced various results and their results could have been affected by how hydrated they were before they performed the experiment.
The temperature of the sulphuric acid was not measured throughout the experiment, however the room in which the experiment was conducted was kept constant, so the chance of any large error due to unknown temperature of the sulphuric acid was most likely reduced. The amount of sulphuric acid used was also controlled by measuring 100mL with a 100mL measuring cylinder to ensure that the results would be consistent. The volume of the agar cubes was calculated from the surface area of each agar cube, both before and after they had been in the sulphuric acid. This increased the reliability of the results as it allowed the rate of diffusion of the sulphuric acid into the agar cubes to be calculated more accurately. The concentration of the acid was 0.1M, which was placed in all three agar cubes to maintain consistency of results.
The equation of the reaction between sodium hydroxide and ethanoic acid is as follows: CH3COOH + NaOH → CH3COONa + H2O We can measure the end point of titration process and we can also measure the amount of reactants. The concentration of ethanoic acid in the vinegar can be determined through stoichiometric calculations, Using the values obtained from the titration, and also the chemical equation as a reference. Phenolphthalein indicator is used in this acid-base titration Equipment and materials:
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.
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
That caused a new initial reading of NaOH on the burette (see Table1 & 2). The drops were caused because the burette was not tightened enough at the bottom to avoid it from being hard to release the basic solution for titrating the acid. The volume of the acid used for each titration was 25ml. The volume of the solution was then calculated by subtracting the initial volume from the final volume. We then calculated the average volume at each temperature.
