A stock solution of 7.99 microM dye is provided. While making one of the standard solutions, a student records the following data. The initial buret reading for dye is 2.58 and for DI water is 1.94. The final buret reading for dye is 8.60 and for DI water is 6.42. Calculate the concentration of dye in the standard. Your answer should be given in microM and reported to two decimal places.

A stock solution of 7.99 microM dye is provided. While making one of the standard solutions, a student records the following data. The initial buret reading for dye is 2.58 and for DI water is 1.94. The final buret reading for dye is 8.60 and for DI water is 6.42. Calculate the concentration of dye in the standard. Your answer should be given in microM and reported to two decimal places.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter4: Least-squares And Calibration Methods

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

You are doing HPLC analysis to determine the concentration of vanillin in an artificial vanilla sample and your standard solutions yield the following data set. 2 mg/L 2340 4 mg/L 3457 6 mg/L 3899 8 mg/L 4500 10 mg/L 4705 12 mg/L 5361 What is the concentration of vanillin in the artificial vanilla sample, given that the peak area of the unknown is 4,285? Answer to 2 decimal places
Part 1: Preparation of the Primary Citric Acid Standard Mass of empty 250-mL glass beaker: 100.7g Mass of 250-mL beaker and anhydrous citric acid First weighing : 103.4 g Second weighing: 106.5 g Third weighing: 106.1 3. Total volume of citric acid solution: 75.0 mL please help me with part Part 1: Preparation of the Primary Citric Acid Standard Mass of Citric Acid _________________________ Volume of Citric Acid Solution ____________ Moles of Citric Acid _________________ (Molar Mass = 192.0 g/mol) Molarity of Citric Acid Solution ____________
What are the types of gravimetric methods? Give an examples where each method is used in an analysis. What is particulate gravimetry? When do we use this technique?
Based on the data in the figure below, knowing that the nominal volumes of the flask, pipette and burette are 100 mL, 10 mL and 12.5 mL (half the volume of the burette) respectively, answer: What is the most accurate volumetric instrument? Show calculations and be careful with scales
Please help me with this one Sugar is the solute and water is the solvent. The drink mix will be considered negligible and is added simply for the visualization of dilution results. Calculate the concentration of sugar in this solution using the volume percent equation. Refer to the background for sample calculations. For the purpose of this exercise, it can be assumed that the weight of the drink mix is 0.00 g. The volume of the solution is 3 and 1/3 cups. Convert to metric units, then calculate and record the volume percent in Data Table 1 (Note that 1 cup = 236 mL). Volume % = Volume of Solute/ Volume of Solution × 100%
It is always important to label everything in the dispensary or the medicinal chemistry laboratory. One student made aspirin and the other student made paracetamol. Both students left their unlabelled samples near the balance. Give details of two techniques that you could use to distinguish between these samples
Stock iron(II) solution (200Ug mL-1 Fe) ferrous ammonium sulfate hexahydrate mass= 0.1437g, transfer it to a 100 ml beaker. add 15 ml approx of water and 15m1 'approx of dilute sulphuric acid (2M H2SO.). then transfer FeII to 100 ml flask makeup to the mark with water. calculate the moles of ferrous ammonium sulfate hexahydrate solution in unit ug/mL.
Complete the table by entering the molarity of B2- for each standard solution. Show an illustrative calculation for tube ‘A’. Use the dilution formula and express each result to one more digit than allowed by applying the rules of significant figures. Standard Volume of stock B2- solution taken, mL Molarity of dilute B2 Construct a graph of Absorbance vs. molarity of B2- in Excel using the data in the preceding table. Make certain to title the graph and include axes labels with proper units. Absorbance is dimensionless (has no unit). Add a linear trendline to the graph but do not set the y-intercept to zero Solid M2B is added to 25 mL of water, the resulting mixture is continually stirred for 1 hour. At this point, it is assumed that equilibrium (eqn 3) has been established. The mixture is transferred to a test tube, and the test tube is centrifuged to assure that any residual solid M2B is fully settled out. A portion of the supernatant in the test tube is carefully…
While carrying out this practical class, all of the 25% (m/v) HCl solution was used up by the students and more of the solution had to be prepared. Concentrated hydrochloric acid containing 37% (m/v) HCl is available. What volume of concentrated hydrochloric acid should be made up to 100 mL with water in order to prepare more 25% HCl solution? Give your answer in mL to ONE decimal place. You do not need to include the units in your answer below.
Starting from the primary standard solution in Question 4 and using the dilution scheme in Figure 1, calculate the concentrations of Standards #1-5. Show all work on a piece of scratch paper. Label each calculation clearly (Standard #1, Standard #2, etc) and circle your final answer for each standard. Be sure to round your answers to the correct number of significant figures and include units. Molarity in #4 is 0.0004089 M or 4.089x10^-4
Case: A prescription for calls for compounding 60 mL of an oral solution for patient A. This oral solution contains 45 mg of salicylic acid. The pharmacist decides to weigh this on a balance with a minimum weighable quantity of 120 mg and dissolve it an appropriate solvent to prepare the solution. Answer the following questions to explain how you will use the liquid measurement aliquot method to obtain the correct amount of salicylic acid to prepare this solution. When making this preparation, you want to minimize the amount of salicylic acid that is wasted. The prescription is as follows: Rx Salicylic acid 45 mg Cherry flavor solution 5 mL Ora-Syrupee qs 60 mL What is the target amount of salicylic acid for the liquid aliquot that will be used to make the 60 mL oral solution? What is the maximum volume of the liquid aliquot can be used to make this preparation? If you weigh 120 mg of…
Approximately 10 mL of 6 M hydrochloric acid were initially added to the euiometer. The eudiometer was then filled with deionized water and placed into a 400-mL beaker contaning ~300 mL of deionized water. Assuming the total volume of solution was 350 mL, and that the solution was uniformly mixed, what was the dilute concentration of the hydrochloric acid?