General, Organic, and Biological Chemistry - 4th edition
4th Edition
ISBN: 9781259883989
Author: by Janice Smith
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 18.4, Problem 18.6P
Decaffeinated coffee is produced by extracting the caffeine from coffee with a solvent. Initially dichloromethane
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Ethanol is miscible with water. Assuming that caffeine is soluble in ethanol, could you use ethanol as a solvent to extract caffeine from coffee, rather than using dichloromethane as the extraction solvent? Explain.
A 1 mL sample of glycogen was calculated to contain 21 µmol (micromole) glucose. To 1 mL of this sample was added 2 mL of 2 M HCl. It was then hydrolysed by boiling the solution for 15 minutes. After boiling the hydrolysate was cooled and made up with H2O to a final volume of exactly 10 mL. The glucose was measured in this solution and found to have a concentration of 340 µg/mL (microgram/milliliter).
i) Calculate the mass (mg) of glucose in the 10 mL of hydrolysate. As the 1 mL of glycogen sample was made up to a final volume of 10 mL, this mass of glucose was produced by the hydrolysis of the original 1 mL glycogen sample.
ii) Calculate the amount (µmol) of glucose produced by the hydrolysis of the glycogen sample.
iii) Calculate the purity of the glycogen used in the sample as
% Purity = (moles of measured glucose/ moles of calculated glucose in glycogen) *100
iv) state your answer in a complete sentence.
Show your working out such that the marker can easily understand it.…
A 1 mL sample of glycogen was calculated to contain 35 µmol (micromole) glucose. To 1 mL of this sample was added 2 mL of 2 M HCL. It was then hydrolysed by boiling the solution for 15 minutes. After boiling the hydrolysate was cooled and made up with H2O to a final volume of exactly 10 mL. The glucose was measured in this solution and found to have a concentration of 570 µg/mL (microgram/milliliter).
i) Calculate the mass (mg) of glucose in the 10 mL of hydrolysate. As the 1mL of glycogen sample was made up to a final volume of 10 mL, this mass of glucose was produced by the hydrolysis of the original 1 mL glycogen sample.
ii) Calculate the amount (µmol) of glucose produced by the hydrolysis of the glycogen sample.
iii) Calculate the purity of the glycogen used in the sample as
% Purity = (moles of measured glucose/ moles of calculated glucose in glycogen) *100
iv) state your answer in a complete sentence.
Chapter 18 Solutions
General, Organic, and Biological Chemistry - 4th edition
Ch. 18.1 - Prob. 18.1PPCh. 18.1 - Prob. 18.1PCh. 18.1 - Prob. 18.2PCh. 18.1 - Prob. 18.3PCh. 18.2 - Prob. 18.2PPCh. 18.2 - Prob. 18.4PCh. 18.2 - Prob. 18.5PCh. 18.3 - Prob. 18.3PPCh. 18.4 - Decaffeinated coffee is produced by extracting the...Ch. 18.4 - Prob. 18.7P
Ch. 18.5 - Prob. 18.8PCh. 18.5 - Naloxone is a drug used to treat overdoses of...Ch. 18.6 - Prob. 18.4PPCh. 18.6 - Prob. 18.10PCh. 18.6 - Prob. 18.11PCh. 18.6 - Name each ammonium salt. a. ( CH3 NH3)+Cl b. [( CH...Ch. 18.6 - Prob. 18.6PPCh. 18.6 - Prob. 18.12PCh. 18.7 - Prob. 18.13PCh. 18.7 - Prob. 18.14PCh. 18.8 - Prob. 18.15PCh. 18.8 - Prob. 18.16PCh. 18.8 - Prob. 18.17PCh. 18.8 - Prob. 18.18PCh. 18.9 - Prob. 18.19PCh. 18.9 - Prob. 18.20PCh. 18.9 - Prob. 18.21PCh. 18.10 - Prob. 18.22PCh. 18 - Prob. 23PCh. 18 - Prob. 24PCh. 18 - Prob. 25PCh. 18 - Prob. 26PCh. 18 - Prob. 27PCh. 18 - Prob. 28PCh. 18 - Prob. 29PCh. 18 - Prob. 30PCh. 18 - Prob. 31PCh. 18 - Prob. 32PCh. 18 - Give an acceptable name for each amine. a. b.Ch. 18 - Give an acceptable name for each amine. a. b.Ch. 18 - Give an acceptable name for each amine. a. b. c....Ch. 18 - Give an acceptable name for each amine. a. CH3(...Ch. 18 - Prob. 37PCh. 18 - Prob. 38PCh. 18 - Prob. 39PCh. 18 - Prob. 40PCh. 18 - Prob. 41PCh. 18 - Prob. 42PCh. 18 - Prob. 43PCh. 18 - Prob. 44PCh. 18 - Which compound in each pair has the higher boiling...Ch. 18 - Which compound in each pair has the higher boiling...Ch. 18 - Draw the hydrogen-bonding interactions that occur...Ch. 18 - Prob. 48PCh. 18 - Prob. 49PCh. 18 - Which compound has the higher water solubility:...Ch. 18 - Prob. 51PCh. 18 - Prob. 52PCh. 18 - Draw the products of each acid-base reaction. a....Ch. 18 - Draw the products of each acid-base reaction. a....Ch. 18 - Prob. 55PCh. 18 - Prob. 56PCh. 18 - What type of nitrogen heterocycle occurs in both...Ch. 18 - Only one of the N atoms in nicotine has a trigonal...Ch. 18 - Prob. 59PCh. 18 - Prob. 60PCh. 18 - Why are aqueous solutions of an alkaloid slightly...Ch. 18 - Prob. 62PCh. 18 - Prob. 63PCh. 18 - Explain why patients with Parkinson’s disease...Ch. 18 - Prob. 65PCh. 18 - Prob. 66PCh. 18 - Prob. 67PCh. 18 - Prob. 68PCh. 18 - Locate the atoms of 2-phenylethylamine in the...Ch. 18 - Locate the atoms of 2-phenylethylamine in the...Ch. 18 - Give an example of an antihistamine. Explain how...Ch. 18 - Give an example of an anti-ulcer drug, and explain...Ch. 18 - Prob. 73PCh. 18 - Prob. 74PCh. 18 - Prob. 75PCh. 18 - Prob. 76PCh. 18 - Prob. 77PCh. 18 - Prob. 78PCh. 18 - Prob. 79PCh. 18 - Why do some antihistamines cause drowsiness while...Ch. 18 - Prob. 81PCh. 18 - Prob. 82PCh. 18 - Compare the structures of morphine and heroin....Ch. 18 - Prob. 84CP
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Solutions: Crash Course Chemistry #27; Author: Crash Course;https://www.youtube.com/watch?v=9h2f1Bjr0p4;License: Standard YouTube License, CC-BY