A neutral compound has a partition coefficient of 7 between ether and water. What percentage of the compound would be extracted from 10 mL of water if: a) 30 mL of ether were used to extract the compound? Answer = (record your answer in decimal notation to 1 decimal) b) 10 mL of ether were used to extract the compound? Answer = (record your answer in decimal notation to 1 decimal)

A neutral compound has a partition coefficient of 7 between ether and water. What percentage of the compound would be extracted from 10 mL of water if: a) 30 mL of ether were used to extract the compound? Answer = (record your answer in decimal notation to 1 decimal) b) 10 mL of ether were used to extract the compound? Answer = (record your answer in decimal notation to 1 decimal)

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter1: Introduction

Section: Chapter Questions

Problem 1.12QAP

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6. ( If the solubility of solute Z is 1.0 g/60 mL in diethyl ether and is 1.0 g/1110 mL in water. a) Determine the partition coefficient for the solute Z in these two solvents. b) If 60 mg of the solute Z were dissolved in 100 mL of water, how much ether would be required to extract 90% of solute Z in a single extraction. c) What percent of the A would be extracted from the aqueous solution in (b) by two 50 mL portions of ether?
What are the differences between systematic and random errors and how do they effect accuracy and precision? In what circumstances would you use standard addition (versus a normal calibration curve) to determine the amount of an analyte in a sample? A urine sample, containing analyte Z is analysed by the standard addition method where 5 mL of the original sample was mixed with increasing amounts of a Z standard and each solution diluted to a volume of 50 mL prior to analysis. A plot of the final concentration of the standard in each of the 50 mL samples (x axis) versus The measured signal from the analysis of each 50 mL sample (on y axis) produced a straight line with the general equation: y = 44.72x + 4.06 what was the final concentration of Z in the 50 mL standard addition sample? what was the initial concentration of Z in the original urine sample?
2. What is the basis for the separation of components of mixtures by paperchromatography?
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.
Normal calibration curves are generally run in water (pure solvent). If there is something in your unknown sample "matrix" which affects the analytical signal, you'll report an incorrect concentration. In this situation you'll choose to run a "standard addition" calibration curve. Standard addition entails adding the same amount of unknown to each of your standard solutions prior to analysis. This transforms your independent variable from "concentration" to "added concentration". These leads to an entirely different calculation for your unknown concentration. A standard addition procedure can be used with any analytical method. In this problem we're conducting a fluorescence assay for a blood protein which is a cancer marker. For the following problem plot a standard addition curve from the data shown below, and calculate the concentration for your unknown. Your unknown number is: 770 Solution 1 is your unknown diluted 25:1 and has an intensity of 5.94 Solution 2 is your unknown…
The diagram shows a simplified output from the detector with peaks for two compounds X and Y. The areas under the peaks are shown in green. What, if anything , can you say about the relative concentrations of X and Y in the mixture? Explain your answer.
The concentration of hydronium ions and hydroxide ions can vary widely in a solution, easily from 1 M to 1 x 10-14 M. This variation is too wide to fit on an analog readout. In order to make this into a smaller scale suitable for an analog readout, the log to the base 10 was used so that the read out is focused on powers of 10. Note that the log [1] = 0, and the log of 1 x 10-14 = -14. It was then decided that the numbers should be positive so the sign was changed. The way to measure concentrations of both H+ and OH- was thus defined as -log. This was then referred to as p. Thus, pH = -log[H+], pOH = -log[OH-], and pK = -log[Keq]. You need to figure out how to do this mathematical manipulation on your calculator. The acid-base reaction in pure water is H2O + H2O ⇔ H3O+1 + OH-1 and it was found that in pure water under standard conditions the [H3O+1] = [OH-1] = 1 x 10-7 M Neutral pH is defined as having a [H+] or [H3O+1] of 1 x 10-7 M. The pH of a neutral solution is thus pH = -log[1 x…
2. What are mobile and Stationary phases in a chromatogram? Site their nature.
1.0 g of a compound A is prepared in 100 mL of water, and then extracted with 50 mL of ether. After the extraction, 0.25 g of the compound was recovered from the ether layer. What is the partitioning coefficient([A]ether/[A]water) for this compound in the system used? 50 ml ether 0g 0.25 g 1g 100 ml water O 4.0 O 3.0 O 1.5 O 0.75 O 0.25 O 0.67
2. A chromatographic column is eluted with a solution containing a mixture of two components, X and Y. The chemical affinity of X for the stationary phase is less than that of Y and the chemical affinity for X for the mobile is greater than that of Y. Which substance will be eluted first? Explain your answer.
What is the purpose of a calibration curve in analytical chemistry?
10 Find the transition time of 20g naphthalene with the surrounding temperature as 30oC.Let the boiling tube has mass 25 g, diameter 2.5 cm and thickness 0.15cm. How much time does 30g of ice takes to melt at a surrounding temperature of -50C. (We are using a boiling tube having mass= 20g, radius=1.5cm, thickness=0.2cm.) In the above experiment, let the surrounding temperature is changed to 0oC. What will be the change in the transition time for ice? Repeat the experiment for different surrounding temperatures and study the variation of melting point of ice. Calculate the melting point of wax having a mass 30g. Let we are using a boiling tube of mass 25g, having a thickness 0.5 cm and radius 1.5 cm.( Choose surrounding temperature as 40oC)