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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 12, Problem 49E
Textbook Problem
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A water sample is found to be high in lead content. Would boiling the water lower the lead concentration? Why or why not?

Interpretation Introduction

Interpretation:

Whether the concentration of lead in the given sample of water can be decreased by boiling, or not, is to be explained.

Concept Introduction:

Water gets polluted due to the presence of various biological and chemical contaminants in it. Biological contaminants include microorganisms such as Giardia, Legionella while chemical contaminants are mercury, lead, benzene, trichloroethylene etc. Both these render water unfit for consumption by human beings and animals, if the contaminant exceeds a certain limit, termed as Maximum Contaminant Limit.

The concentration of a contaminant is reported as the mass of contaminant (in milligrams) present in one liter of water.

Hard water is a solution of calcium and magnesium salts in water. Presence of calcium and magnesium ions makes water hard and renders it unusable for various purposes, such as cleaning clothes and utensils, bathing and in water heaters etc.

Boiling of water cannot get rid of contaminants because this decreases the total volume of the sample of water but the mass of contaminant remains same. Moreover, the concentration of contaminant increases.

Explanation of Solution

The amount of lead remains the same because it does not evaporate at boiling point of water.

The concentration of lead is defined as the amount of lead present per unit volume of solvent or solution...

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Chapter 12 Solutions

Chemistry In Focus
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Ch. 12 - A representation of liquid water is shown below....Ch. 12 - A mixture initially contains equal masses of...Ch. 12 - An older home has lead pipes. Should you boil the...Ch. 12 - Why are liquid drops spherical in shape?Ch. 12 - Would there be solids and liquids if cohesive...Ch. 12 - From a molecular viewpoint, explain the...Ch. 12 - Explain evaporation from a molecular point of...Ch. 12 - Define each of the following: a. boiling point b....Ch. 12 - Describe the relationship between intermolecular...Ch. 12 - Define each of the following intermolecular forces...Ch. 12 - Why do oil and water not mix?Ch. 12 - Explain how soap works.Ch. 12 - Define volatile and nonvolatile. How are these...Ch. 12 - Why does sweating cool the human body?Ch. 12 - Define each of the following: a. solution b....Ch. 12 - What are the unique properties of water? Why are...Ch. 12 - Where did Earths water come from?Ch. 12 - Explain the hydrologic cycle.Ch. 12 - What are the impurities present in hard water?...Ch. 12 - What are the common classifications of water based...Ch. 12 - How does a water softener work?Ch. 12 - List the four types of contaminants commonly found...Ch. 12 - Which water contaminants pose immediate health...Ch. 12 - What steps should be taken to minimize intake from...Ch. 12 - What is the SDWA?Ch. 12 - Explain how drinking water is treated before being...Ch. 12 - Is home water treatment necessary for health...Ch. 12 - Explain how each of the following home...Ch. 12 - Explain the concerns that groups like the EWG or...Ch. 12 - Butane is a gas at room temperature, and hexane is...Ch. 12 - One of the following molecules is a solid at room...Ch. 12 - Which compound would you expect to have the...Ch. 12 - Which compound would you expect to have the...Ch. 12 - All the following are liquids at room temperature....Ch. 12 - Which liquid would you expect to be least...Ch. 12 - Classify each molecule as polar or nonpolar:...Ch. 12 - Classify each molecule as polar or nonpolar:...Ch. 12 - What are the criteria used by the perfume industry...Ch. 12 - Two nonpolar substances with similar structures...Ch. 12 - What is the molarity of a solution that contains...Ch. 12 - What is the molarity of a solution that contains...Ch. 12 - How many grams of sucrose (C12H22O11) are present...Ch. 12 - How many grams of glucose (C6H12O6) are present in...Ch. 12 - How many grams of NaCl are present in 225mLofa2.3%...Ch. 12 - How many grams of NaF are present in 4.5 L of a...Ch. 12 - A 250-g sample of hard water contains...Ch. 12 - A 15-g sample of water contains 1.110-3gofCaCO3....Ch. 12 - Tap water is often fluoridated with a sodium...Ch. 12 - A softened water sample contains 245 ppm Na. If a...Ch. 12 - A 475-mL sample of water is extracted from a well...Ch. 12 - A 255-mL sample of water is taken from a tap and...Ch. 12 - A water sample is found to be high in lead...Ch. 12 - Your water provider posts an alert in the local...Ch. 12 - The quote by Roger Joseph Boscovich at the...Ch. 12 - Explain the difference between a polar molecule...Ch. 12 - The EPA has become concerned over the use of lead...Ch. 12 - When water is boiled, it is converted into a gas....Ch. 12 - Suppose a perfume contained the following two...Ch. 12 - Explain what you think might be occurring in dry...Ch. 12 - Over half of our nations drinking water contains...Ch. 12 - The following drawing shows a molecular view of a...

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