In Part I the reaction you observed was Mg(OH)2 (s) ↔ Mg2+ (aq) + 2 OH- (aq). Compare the colors you observed in the experiment and answer these questions: Which way should the equilibrium shift when HCl is added? How do your results support your answer? It should shift toward the reactants. It is shown by removing the pink color from the product.
As for endothermic the reactions pulls in energy and makes it cold to touch. The other experiment measured the pH level in the reaction. The reaction consisted of sodium hydroxide and hydrochloric acid also to see at which point the reaction becomes neutralized. Neutralization is a reaction between an acid and a base forming a salt and water even tho you can’t see the salt due to the salt dissolving into the solution and the pH level of the reaction around level 7 and has a green sometimes yellow colour when the universal indicator is added. The neutralization gap shows how small the gap is to make the reaction neutral.
Ultimately, this had an effect on the U.S. 1954 desegregation decision. 2. a) Explain the difference between an independent variable and a dependent variable. Consider an experiment in which attention is measured on a rating scale before and after participants receive either a new drug for increasing attention or a placebo. b) What is the independent variable in this study? c) What is the dependent variable?
2. What risks are associated with switching to Saxton? Do the cost savings outweigh the risks? 3. What other options would you consider?
Experiment 9 - Effects on Vitamin C (with PH) Research Question: How does the change of PH (increase of decrease) effect the amount of vitamin C in a vitamin C solution? Goal of Experiment: Have the opportunity to independently design and perform a scientific study on an aspect of vitamin C decomposition. Hypothesis: I predict that by introducing HCl or NaOH into the vitamin C solution the percentage of vitamin C present in the solution will decrease. Abstract: The purpose of this lab is to determine the effects that changing the PH of a vitamin C solution will have on the concentration of vitamin C. The concentration changes will be calculated after 6 titrations (2 control, 2 with added NaOH, and 2 with added HCl) . Once calculated, these results can be analyzed and will either validate or refute my hypothesis.
(the one you measure) * Why did you choose this particular variable to be your dependent variable? * Write any chemical equations involved? * What do you expect your results will show you in this investigation? * List of equipment you will use * What will you use to measure the independent variable? (the one you change) * What will you use to measure the dependent
By understanding the kinetics of the process of the breakdown of drug, the amount of drug decomposes in a given time can be predicted. The effect of temperature on the stability of acetylsalicylic acid (aspirin) was being investigated in this experiment. The equation of the reaction of acetylsalicylic acid is: Acetylsalicylic acid Acetic acid + Salicylic acid The application considered here was the stability of aspirin in solution, and how the rate of decomposition varied with temperature. From the above equation, acetylsalicylic acid would decompose to acetic acid and salicylic acid under moist condition. To obtain the kinetic data on the stability of drug, a test known as ‘accelerated stability test’ was taken.
For instance, the neutralization of HCl by NaOH is written as: HCI + NaOH -----------> NaCl + HOH Equations for neutralization reaction are balanced so that the amount of H+ will be equal to the amount of OH-. The addition of a specific amount of base required to neutralize an acid in a sample involves a titration. An indicator in a sample will change color when all the H+ from an acid has been neutralized. The addition of a base should be stopped when the indicator changes color which therefore determines the endpoint. At this point the volume of base used to neutralized the acid can be determined.
Reaction Scheme [pic] Although sulfanilic acid is insoluble in acid solutions, it is nevertheless necessary to carry out the diazotization reaction in an acid (HNO2) solution. This problem can be avoided by precipitating sulfanilic acid from a solution in which it is initially soluble. The precipitate is a fine suspension and reacts instantly with nitrous acid. The first step is to dissolve sulfanillic acid in basic solution. When the solution is acidified during diazotization to form nitrous acid, the sulfanilic acid is precipitated out of solution as a finely divided solid, which is immediately diazotized.
Berhanu Haile, will present Question No.3A which is part of question no.3; Assume you are Jasper. What are the first two action steps you would take to handle the Henery Darger situation? How would your role as a cultural leader influence your decision? Solomon Amsalu, will present Question No.3B which is part of question no.3; What message will your solution send to the other managers and rank-and- file employees? And the Summary part of the case study.