Using the reagents available in Table 4.2 of the lab manual, which answer correctly represents all of the reagents Jason used for his Part B procedure in order to obtain the products shown in the particle diagram? O 3 M H3PO4 and then Mg metal O 3 M H2SO4 and then Mg metal O 3 M H2SO4 and then Zn metal O 3 M H2SO4 and then Cu metal O 3 M NAOH and then Cu metal
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- What do you call the type of analytical method that relies on the absolute stoichiometric equivalences of balanced chemical reactions in order to compute the amount of analyte present in the sample? Oxidative methods Instrumental methods Classical methods Blank Correction Methods5. It's important in a lab to avoid cross-contamination of reagents. Imagine that a Pasteur pipette that was used for hydrochloric acid was then used for performing the Finkelstein test. Anticipate whether this might cause a false-negative or a false-positive test. Show your reasoning. Similarly, predict whether this contaminated pipette would cause a false-positive or a false-negative result for the silver nitrate test.If an analytical method relies on a measurable property of an analyte that can be correlated with the amount of the said analyte, what type of analytical method is it? Oxidative methods Instrumental methods Blank Correction methods Classical methods
- In Part 1 of the experiment, you will generate a calibration curve in order to determine el for this reaction. In order to ensure that the [Fe(SCN)2*] for these calibration solutions is accurately known, a large excess of SCN is used, so that the equilibrium for these solutions lies heavily to the products, and we can assume all of the Fe2* added becomes Fe(SCN)2*. In Part 2, you will observe solutions prepared with various initial reactant concentrations in order to determine Keg for the formation of iron(II) thiocyanate.3. A student separated an unknown mixture of ions using the procedure of Part A. When the spots were made visible, a faint spot corresponding to Cu2+was seen. However, the student later learned that the unknown did not contain Cu2+, Which of the following could cause this result?a. The same spotting capillary was used to spot the Cu2+sample and the unknown sample.b. The Cu2+sample was contaminated with Co2+and Fe3+c. The chromatography paper was not trimmed to the correct dimensions.d. The position of the mobil-phase front was incorrectly marked.Explain your answer.When the compounds analyzed by Robrob were passed on to the next test, another scientist, Kikoko, needed to determine the molecular weight of the ctive compound. They created a solution with a concentration of 20.0%w/w from the solid active compound and the solution had a density of 1.40 g/mL. From this solution, 10µL was taken and mixed with 190µL of reagent and water. It was analyzed and showed a concentration of 5x10-4 M compound. a. What is the concentration (in molarity) of the 20%w/w solution? b. Why was the concentration of the solution expressed as %w/w initially? c. What is the molecular weight of the active compound?
- For this exercise, let's say that you begin with an aqueous mixture containing the following compounds: Ba(NO3)2, Mg(NO3)2, and AgNO3 You also have separate solutions, one of each: K2SO4 (aq), KCl (aq), and KOH (aq) Let's call these the challenge reagents. Your task is to propose a step-by-step procedure for sequentially separating the cations in your mixture, one at a time. You must include What challenge reagent to add first? Which cation will precipitate? What is the equation for that reaction? and How will you separate the precipitate from the rest of the mixture so you can go on to the next challenge reagent? and so forth with the next cation...PART ONE: Preparation of FECNS* Solution Prepare the two solutions in table 1 by accurately measuring the required volumes of distilled water and CNS into two labeled test tubes. The absorbance of the solutions must be measured soon after adding the Fe" solution from a buret. TABLE 1 Fe 5 ml 5S mL Solution Distilled Water CNS 2 mL Total Volume 3 ml 2 ml 10 ml 3 mL 10 ml In this part of the experiment you are to explore what the above quote means. As a PRELIMINARY Exercise, formulate a hypothesis as to what would happen under each of the following circumstances: 1. 1ml of 0.0020 M CNS' solution is added to the unused portion of solution 1 in the test tube 2. One drop of 0.20 M CNS solution is added to the unused portion of solution 2 in the test tube.22 Experiment 2 Chromatography 32. A student properly sets up a column chromatography experiment. Although the mixture is soluble in the mobile phase, the sample appears "stuck" at the top of the column and will not elute regardless of how much solvent is applied. What could be the cause of this prob- lem and what could the student do to try and achieve a successful separation? NA disolves in #20 Salt No maybe the compound NASI is to much an the solvent being #20 is to little Vodafo 3. A student performs a separation by TLC on a silica get plate that results in three spots. A red spot is measured 23 mm away from the original sample spot, a blue spot is 42 mm away, and a yellow spot is 49 mm away. The distance from the original spot to where the solvent stopped is 55 mm. a) Calculate the Re value for each component in the mixture. (Show your work and report the correct number of significant figures.) highest polarity. Explain your answer. b) The silica gel plate is polar. Rank the three…
- Paolo added 5.8 mL of 4.9 M NaOH to 5.4 mL of 0.89 M HCI. Calculate the concentration, in units of M, of excess OH in the resulting solution. Note: Do not use scientific notation or units in your response. Sig figs will not be graded in this question, enter the unrounded value to four decimal places. Carmen may add or remove zeros from your response, your submission will still be graded correctly if this happens.B. Organic Derivatives of Water Five organic derivatives of water were analyzed by various qualitative tests and the summary of their reactions is given in Table 2 below. Identify each unknown sample by matching the respective reaction profile with the given structures (A, B, C, D or E). Table 2. Summary of Reactions of Organic Derivatives of Water Sample Jones Test Lucas test Iodoform test FeCl3 test 1 Blue-green precipitates No reaction No reaction No reaction 2 No reaction Cloudiness No reaction No reaction 3 No reaction No reaction No reaction No reaction 4 No reaction No reaction No reaction Violet color 5 Blue-green precipitates Cloudiness Yellow precipitates No reactionThe thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid solution and titrated with 37.31 mL of 0.009372 M Hg2+ via reaction: 4(NH2)2CS + Hg2+ →[(NH2)2CS]4 Hg2+ Is this an example of total analysis technique or concentration technique? Explain.