5 Prelab Reading Dilutions and Standard Curve

5. In preparation for the analyses of other types of samples that may reach your laboratory, the supervisor tasked you to research different extraction procedures for the analyses of Tetrahydrocannabinol (THC) and other related compounds so that you can purchase different extraction instruments. How will you convince him to buy a Supercritical Fluid Extraction Instrument? C

5. Which term is INCORRECTLY defined? a. linear range - the range over which the response of an analytical method is proportional to analyte concentration b. dynamic range concentration range over which there is a measurable response to analyte, though the response is not linear c. blank solution - a solution containing all reagents and solvents used in the analysis to which no analyte is deliberately added d. standard solutions - solutions for which the standard deviation is known - 6. True or False: Internal standards correct random error caused by run-to-run variation. a. True b. False

1. In this method, the mass of the analyte or a compound derived from the analyte is determined. 2. Spectroscopic methods of analyses measure the interaction between, analyte atoms, molecules, or emission of radiation by analytes. 3. and samples are materials where its constituent parts can be distinguished visually or with the aid of a microscope. 4. These types of samples must be contained in closed containers to avoid its evaporation and change in concentration. 5. The indicated name. is a process of determining how much a given sample is the material by its 6. The components in a sample aside from the analyte that affects the final measurement are called 7. Techniques or reactions that apply to a few analytes are said to be usually requires a large investment of time 8. An analytical method with high and money. 9. This is a process of collecting a small mass of a material whose composition accurately represent the population. 10. The ultimate objective in a chemical analysis is to…

7 determination of sodium, potassium and calcium in water samples by ICP-OES. 1. kindly assist me with discussion in the experiment 2. results of the experiment 3 experimental/ methodology

Why is the glucose assay one of the most common analytical test performed in clinical chemistry.

A sample of rainwater was collected from four separate locations across theMetroplex. Each sample was measured once by two separate methods for the presence ofsulfate. Determine whether the two methods are equivalent with respect to giving thesame answer for [SO42-].

urses/55527/quizzes/401369/take → # 3 Complete the data table using the calculation process you used to complete the previous question. Be sure to keep a copy of the completed table to include in the lab report for this experiment. $ Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 4 1.00 M Acetic Acid volume HC₂H3O2 25.0 mL 25.0 mL 25.0 mL 25.0 mL 25.0 mL Q Search f5 % moles 5 f6 Mole Ratio 6 HC₂H3O2 : NaHCO3 3:1 2:1 *All values should contain three (3) significant digits. 1:1 1:2 1:3 U hp NaHCO3 Molar Mass: 84.007 g/mol moles fg * 99+ 8 a fg mass needed DO 9 f10 ► 11

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.

Analytical Chemistry Laboratory Experiment: Determination of Iron Content in Water Samples by Visible Spectroscopy

Pre-Lab Questions Experiment 12 Food Chromatography: The Distance Our Food Travels Name: Section: Instructor: Date: Imagine you have a solution that is comprised solely of component A. You have another solution that is comprised solely of component B, and yet a third solution that is comprised solely of component C. Component A's retention factor is about 0.84, Component B's retention factor is about 0.21, and Component C's retention factor is 0.55 in the same solvent system. You then have a fourth solution that is composed of components A and C. 145 You spot each solution on a piece of chromatography paper and allow the solutions to separate. Sketch what you think your paper would look like below.

NaOH is the base (please elaborate) Thank you!

25. In the paper chromatography experiment on food dyes, salt water was used as the A. mobile phase B. stationary phase C. eluent D. solute E. sample spots

Why is strict implementation of LQMS (Laboratory Quality Management System) or GLP is necessary ? What are the elements ?

Assume the data below was collected for two different sample solutions using the same experimental procedure you carried out. Based on the two lines shown below, which solution (orange data points or blue data points) corresponds to the sample with the higher molar absorptivity? 0.9 y4.771 - 0.0728 0.7 0.6 04 0.3 02 y1414 - 0.0546 R0.99642 0.1 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 02 0.1 [Concentration, M] orange data points (lower line) O blue data points (upper line) Absorbance

In an extraction procedure, it is advisable to: O put the aqueous layer down the drain put the organic layer in the aqueous waste throw away all layers as soon as you have extracted them save all layers until an experiment is complete

4.Discussed the Purposed of the Golden rules in the practice of Forensic Chrmistry.

Table of chemicals and reagents with their physicochemical properties (name, molecular formula, molecular weight, pKa, melting point, boiling point, etc.) Write a short outline or a flow diagram of the procedure List and safety issues Read and understand the MSDS information for each chemical used in this practical Experimental procedure Please do not scratch the clear sides of the UV cuvettes as this will invalidate your results. Part 1: Preparation of a calibration curve A calibration curve should be constructed using at least five concentrations of the pure paracetamol standard supplied in the range 3-15 ug/mL as follows: Weigh about 150 mg of paracetamol accurately and transfer to a 200 mL volumetric flask. Add 50 mL of o.1 M NaOH and dilute to about 100 mL with deionised water (DI). Shake and make up to volume with DI water. Dilute 10 mL of the resulting solution to 100 mL (volumetric flask) with DI water (= stock solution). Prepare standard solutions containing 3, 6, 9, 12 and 15…

Hello please help with number 4.

i need help calculating the molar concentration for part C

PART 3- LABORATORY EQUIPMENT EQUIPMENT NAME FUNCTION To hold test tubes. Attaches to a retort stand to support glassware being heated. To pour liquid from a large container into a small container. To provide a flame during an experiment. ones To light the Bunsen burner. To attach test tubes to a retort stand. To clean substances out of a test tube. To hold a hot crucible or flask. To hold a hot test tube. To place on the lab bench to prevent burning or to use with ring clamp. To transfer small amounts of liquid. To grow bacteria or contain small experiments. To hold liquids. To measure liquids. To contain experiments (a stopper can be used to close the flask). To hold a hot beaker. To perform an experiment with a different substance in each well. To hold chemicals and perform experiments in. To scoop and transfer small amounts of substances, To stir during experiments that involve mixing or dissolving.

7. How is the volume of analyte measured and transferred into the conical (Erlenmeyer) flask?

Which of the following will give a negative deviation to Beers Law?  I. polychromatic radiation II. presence of stray light III. presence of particulates on the sample A. I and II only        B. II and III only        C. I and III only       D. I only

Give answer all questions with explanation please

Please see attached image.

5. Which tablet size and the liquid combination resulted in the fastest dissolution times? A. crushed, room temperature water B. crushed, hot water C. crushed, room temperature vinegar D. broken, hot water E. broken, room temperature vinegar 6. What is the relationship between particle size and the time it takes for the tablet to dissolve? A. direct proportion B. inverse proportion C. combined proportion D. joint proportion 7. Using the activity as a model, how does mechanical weathering (breaking or crushing) contribute to chemical weathering (dissolution)? A. Increases size of particles B. Decreases dissolution time C. Increases surface area D. Both A and B E. Both B and C

Question is attached

Please help do the brown sugar and white sugar separately

Can you solve and complete this chart

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

Please do it fast

Multiple choice. Please check my answers from 5-9 if they are correct. Thanks!

STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.

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…

While in lab, you find that your liquid begins to vaporize at 98.2°C. After finishing the experiment, you calculate (and obtain from another group) the following molar mass values. Calculate the standard deviation for the following the molar masses. Report your answer with two places after the decimal. Note: Copying and/or posting this question without the express written permission from Dr. Burke and the Department of Chemistry & Biochemistry at the University of Delaware is a violation of intellectual property copyright law. Data Table Trial #Molar Mass 1 2 3 4 100.63 100.44 101.06 99.63

Stoichiometry: Prolonged exposure of some functionalities to the eluent (methanol) in this experiment may lead to undesirable reactions. In one case, Acetylsalicylic acid (Aspirin) can react with methanol to form salicylic acid and methyl acetate. If 800 mg of Acetylsalicylic acid and 1 mL of Methanol undergoes such a side reaction (known as "Methanolysis") to completion: (a) write a balanced equation (draw all molecules instead of writing chemical formulas), (b) what is the limiting reagent? (c) predict the grams of salicylic acid and methyl acetate to be produced in this process. Show calculations. Hint: you can determine the grams of 1 mL of Methanol through its density.

Calculate the cfu per ml of each dilutions and cfu per ml of the stock suspension (highlighted below). Show your solutions.