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Chapter 21: Problem 15

$$ \text { Define acid and base. (p. } 812) $$

Short Answer

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Acids increase H鈦� ions in water, and bases increase OH鈦� ions.

Step by step solution

01

Understanding Acids

An acid is a substance that, when dissolved in water, increases the concentration of hydrogen ions (H鈦�) in the solution. It often has a sour taste and can turn blue litmus paper red. An example of an acid is hydrochloric acid (HCl).
02

Understanding Bases

A base is a substance that, when dissolved in water, increases the concentration of hydroxide ions (OH鈦�) in the solution. It often has a bitter taste and can turn red litmus paper blue. An example of a base is sodium hydroxide (NaOH).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Hydrogen Ions
In the fascinating world of chemistry, hydrogen ions, symbolized as \(H^+\), are at the core of understanding acids. When substances dissolve in water and release hydrogen ions, the concentration of these ions increases, meaning more \(H^+\) are present in the solution. This process is what classifies a substance as an acid.
  • A higher concentration of hydrogen ions in a solution results in a lower pH value, usually less than 7, making the solution acidic.
  • Common examples of acids are vinegar, which contains acetic acid, and citrus fruits like lemons and oranges, which contain citric acid.
  • The sour taste associated with acids is due to the presence of hydrogen ions, as they interact with the nerve endings on our tongue.
Understanding hydrogen ions and their role in acidity is fundamental for exploring more complex chemical reactions and interactions.
Hydroxide Ions
On the flip side of acid chemistry, we have bases, which are often linked with the presence of hydroxide ions, represented as \(OH^-\). When a base dissolves in water, it increases the concentration of hydroxide ions in the solution. This is the hallmark of a substance being categorized as a base.
  • A higher concentration of hydroxide ions results in a solution with a pH value greater than 7, indicating basicity or an alkaline nature.
  • Bases are typically bitter-tasting and often have a slippery texture. Examples include household cleaners like bleach and baking soda.
  • In addition to their taste, hydroxide ions turn red litmus paper blue, which is a traditional test for basicity.
Grasping the concept of hydroxide ions helps in comprehending how neutralization reactions work and in balancing chemical equations that involve acids and bases.
Litmus Test
The litmus test is a simple but effective method used to determine whether a substance is acidic or basic. This test involves a special type of paper, known as litmus paper, which has been treated with a specific dye that changes color based on the pH of the solution it comes into contact with.
  • When acids are tested, they cause blue litmus paper to turn red, indicating the presence of hydrogen ions.
  • Conversely, bases turn red litmus paper blue, showing the presence of hydroxide ions.
  • This test is qualitative, offering a straightforward way to differentiate between acids and bases quickly.
While not providing an exact pH value, the litmus test remains a widespread and invaluable tool for rapid analysis in various scientific and educational settings.

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Most popular questions from this chapter

Explain how the respiratory system functions in the regulation of acid-base balance. (pp. 815-816)

Distinguish between a chemical buffer system and a physiological buffer system. (p. 816)

Explain why a protein has both acidic and basic properties. (pp. 814鈥�815)

Describe the mechanisms by which the renal tubules regulate electrolyte balance. (p. 812)

Electrolytes in body fluids of importance to cellular functions include ____________. (p. 809) a. sodium b. potassium c. calcium d. all of the above
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