Textbook Question
The concentration of cholesterol (C27H46O) in blood is approximately 5.0 mM. How many grams of cholesterol are in 250 mL of blood?
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Ch.9 Solutions
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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Table of contents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Not the one you use?Change textbook
Chapter 9, Problem 17
The Environmental Protection Agency has set the limit for arsenic in drinking water at 0.010 ppm. To what volume would you need to dilute 1.5 L of water containing 5.0 ppm arsenic to reach the acceptable limit?
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Identify the initial concentration (C1) of arsenic in the water, which is 5.0 ppm.
Identify the final concentration (C2) that you want to achieve, which is 0.010 ppm.
Identify the initial volume (V1) of the water, which is 1.5 L.
Use the dilution formula C1 * V1 = C2 * V2 to find the final volume (V2).
Rearrange the formula to solve for V2: V2 = (C1 * V1) / C2.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Dilution Principle
The dilution principle states that when a solution is diluted, the amount of solute remains constant while the volume of the solution increases. This relationship can be expressed mathematically as C1V1 = C2V2, where C1 and V1 are the initial concentration and volume, and C2 and V2 are the final concentration and volume after dilution.
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Dilutions
Parts Per Million (ppm)
Parts per million (ppm) is a unit of measurement used to describe the concentration of a substance in a solution. It indicates how many parts of a substance are present in one million parts of the solution, making it a useful measure for very dilute concentrations, such as contaminants in drinking water.
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01:38Parts per Million (ppm) Concept 1
Environmental Standards
Environmental standards are regulatory limits set by agencies, such as the Environmental Protection Agency (EPA), to protect public health and the environment. These standards, like the arsenic limit of 0.010 ppm in drinking water, are based on scientific research and aim to minimize exposure to harmful substances.
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01:21Standard Temperature and Pressure Concept 2
Related Practice
Textbook Question
The diagram to the right shows plots of vapor pressure versus temperature for a solvent and a solution.
b. What is the approximate boiling-point elevation for the solution?
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Textbook Question
The maximum amounts of lead and copper allowed in drinking water are 0.015 mg/kg for lead and 1.3 mg/kg for copper. Express these values in parts per million, and tell the maximum amount of each (in grams) allowed in 100 g of water.
Textbook Question
When 1.0 mol of HF is dissolved in 1.0 kg of water, the boiling point of the resulting solution is 100.5 °C. Is HF a strong or weak electrolyte? Explain.
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Textbook Question
At a total atmospheric pressure of 1.00 atm, the partial pressure of CO2 in air is approximately 4.0 × 10-4atm. Using the data in Problem 9.4, what is the solubility of CO2 in an open bottle of seltzer water at 20 °C?
Textbook Question
The typical concentration of Mg2+ in blood is 3 mEq/L. How many milligrams of Mg2+ are in 250 mL of blood?