Prentice Hall Biology (California)
Prentice Hall Biology (California)
1st Edition
Kenneth R. Miller, Levine
ISBN: 9780132013529
Textbook solutions

All Solutions

Section 2.2: Properties of Water

Exercise 1
Result
1 of 1
A water molecule is polar due to the unequal distribution of electrons that occurs between an oxygen and hydrogen atoms. Because of this uneven distribution, the positive end of the hydrogen atoms are attached to the negative end of the oxygen atom.
Exercise 2
Solution 1
Solution 2
Step 1
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Acidic solutions have high H+ concentrations and low OH- concentrations, and the opposite for basic solutions. The lower the pH, the more acidic. So, to increase pH, add more base or OH- ion.
Result
2 of 2
See explanation
Step 1
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A solution can either be acidic or basic based on the relative concentrations of H$^+$ and OH$^-$ ions. In an *acidic* solution, the concentration of H$^+$ ions is relatively **higher** than the concentration of OH$^-$ ions.
Step 2
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On the other hand, the concentration of H$^+$ ions in a *basic* solution is relatively **lower** than the concentration of OH$^-$ ions. This means that there are more OH$^-$ ions than H$^+$ ions in a basic solution, which is opposite to that of acidic solutions.
Step 3
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The acidity or basicity of a particular solution can be measured using a pH scale. Acidic solutions typically have a pH lower than 7, while basic solutions usually have a pH higher than 7. Solutions with a pH of 7 are considered to be neutral.
Exercise 3
Step 1
1 of 2
$textbf{Solution}$ is a mixture composed of two or more substances in which the molecules are $text{underline{evenly distributed}}$.
Step 2
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$textbf{Suspension}$ is a heterogenous mixture of liquid and undissolved particles, that eventually form sediments upon standing.
Exercise 4
Step 1
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It measures acidity or alkalinity.
Result
2 of 2
See explanation
Exercise 5
Step 1
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. An acid is a compound that produce hydrogen ($H^+$) ions in solutions.

A base is a compound that produce hydroxide ($OH^-$) ions in solutions.

The aqueous acid solutions have a pH value of less than 7. A lower pH means a higher acidity.

The aqueous base solutions have a pH value of greater than 7. A higher pH means a lower acidity.

Step 2
2 of 3
.
The hydrogen fluoride acid dissolved in pure water and form hydrogen ions in the solution:

$HF + H_2O rightleftharpoons H_3O^+ + F^-$

$HF$ loses $H^+$; the level of $H^+$ ions increased in the solution.

So, this reaction will cause the pH value decrease than it was in pure water, i.e. $textbf {the pH will be less than 7}$.

Result
3 of 3
The pH of the solution will be less than 7.
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