The purpose of this lab is to determine the Ka of an indicator within an unknown solution. This can be determined because acid-base indicators are weak bases or acids, and when neutralized they change colors. The color change is measured by the light absorption spectra in the compound which can be used to calculate the concentration. This experiment measures the concentrations by the different pH values which allows the pKa and Ka to be determined. Through the experiment, and the recorded color change with the use of the Spec 20 the unknown Ka of the solution was found.
As stated previously because acid-base indicators are weak bases or acids, they change colors. This color change will be used to determine the concentration because…
Optimisation studies were carried out on the basis of varying initial concentration of Chitosan and Xanthan, and varying pH of Chitosan solution. The results obtained were interesting. Unstable capsules were formed with the following combination of Xanthan and Chitosan concentration. The Chitosan solution pH was kept constant at 5.
The above table gives the inference that when Xanthan concentration is less than or equal to 0.5% or Chitosan concentration is less than or equal to 0.5%, the…
Accuracy and Precision Lab Report
By Connor MacFarland
What is the difference between accuracy and precision and how can we demonstrate the difference?
100 mL Graduated Cylinder
1 Gallon of water
Unmarked Plastic Container
3 different kinds of Rocks of different sizes
Triple Beam Balance
Estimating Lengths Procedure
A piece of notebook paper was torn into 8 rectangles
Without a ruler, a line was drawn which…
environment. Nickel manganese cobalt oxide (NMC) made up many of these batteries and could dissociate in aquatic environments. Prior experiments, such as Hang et. Al. 2016, reported detrimental effects of dissociated NMC on aquatic microorganisms.1 In the first part of this project, the objective was to explore and develop an effective method to measure nickel (Ni) and cobalt (Co) concentration spectrophotometrically. This step was crucial for the second part of the project, which was to…
. The direct band gap energy (Eg) of Tb3+: SA crystals grown by SEST and SR methods are found to be 4.20 eV, 4.10 eV respectively, which is in good accordance with the reported values . The value of band gap of Sulfamic acid was found to decrease with increase in impurity concentration and it is found between 4 and 5 [54, 55].
Fig(7). Plot of α vs. photon energy.
3.6 Thermogravimetry (TG) and differential thermal analysis (DTA)
Thermogravimetry (TG) and differential thermal…
Also germination is stimulated by an uptake of water and due to the shortage of H+ ions in more alkaline solutions this may delay or terminate germination. The pH of soil can affect the spread of important nutrients with in the soil, and unevenness can prevent a plant from absorbing them. Before plants can use a nutrient it must be dissolved in the soil solution. Most minerals and nutrients are most soluble and so more available for plant absorption in a pH of just below 7, rather than in soils…
molecules under mild conditions because monomeric avidin has an lower affinity for biotin binding (Kd is ~ 10‘ M ). Free monomeric avidin in solution can be obtained by treatment of native tetrameric avidin with acid or guanidine-HCl (Sharma, Bagshawe, and Begent, 2005).
Modification for pre-targeting: In pre-targeting strategies to deliver cancer therapeutics, faster dissociation kinetics of avidin-biotin system may be required. Increased dissociation kinetics is a different goal from…
benzoic acid. The benzoic acid we were given was made by the 102 chemistry students, meaning that it wasn’t properly made. Students have said that they were rushed and weren’t able to take their time to filter the solid out of the solution. We had to do this for our 102 lab, and I know that our class was being rushed, and it didn’t help that this was the first time working with a funnel filtration. Working with a possible impure benzoic acid is an important thing to note for this experiment.…
that the sample has a high level of soluble ionic constituents. If the sample is shown to be acidic and has a high level of soluble ionic constituents, then that may indicate that more extensive and intensive tests should be done to confirm the results for AMD generation potential.
For the acid base accounting test, the samples will be divided into categories (requires or does not require further determinative acid potential generation test work) based off the comparison of the…
The % relative standard deviation (% RSD) was found to be below 5 % for all the four analytes in system precision and below 6 % in method precision. The data as shown in Table 126.96.36.199.3 and 188.8.131.52.4. LOD values observed for Hydrazine carbamate and Hydrazone carbamate were 0.0018 µg per mL and 0.00092 µg per mL respectively. The LOD value observed for both 1-Hydroxy benzotriazole and 2R, 3S Chlorohydrine hydrochloride were 0.0019 µg per mL. The LOQ values observed for all four analytes were…