Acids and Bases Quiz

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Questions and Answers

What is an acid?

An acid is an aqueous solution that has H+ ions. The more H+ ions, the more acidic the solution.

Which of the following properties is associated with acids?

  • Feels slippery
  • Turns red litmus paper blue
  • Turns blue litmus paper red (correct)
  • Tastes sour (correct)

Which of the following is a common acid?

  • Calcium hydroxide
  • Ammonia
  • Sodium hydroxide
  • Hydrochloric acid (correct)

What is a base?

<p>A base is an aqueous solution that has OH- ions, also known as alkaline solutions.</p> Signup and view all the answers

Which of the following properties is associated with bases?

<p>Tastes bitter (A), Feels slippery (C)</p> Signup and view all the answers

What does the pH scale measure?

<p>The pH scale measures the acidity or basicity of a solution, ranging from 0 to 14.</p> Signup and view all the answers

What is the pH of a neutral solution?

<p>7 (C)</p> Signup and view all the answers

What does the formula pH + pOH equal?

<p>pH + pOH = 14</p> Signup and view all the answers

How do you calculate pH from the concentration of hydrogen ions?

<p>pH = -log[H+]</p> Signup and view all the answers

If a solution has a concentration of hydrogen ions of 0.01M, what is its pH?

<p>2 (A)</p> Signup and view all the answers

The more H+ ions, the more _____ the solution.

<p>acidic</p> Signup and view all the answers

Flashcards

What is the pH scale?

Measures acidity/basicity; range 0-14. 7 is neutral.

What determines pH?

Determined by [H+]. Higher [H+] = more acidic.

How do [H+] and [OH-] relate?

[H+] > [OH-] (acidic), [OH-] > [H+] (basic), [H+] = [OH-] (neutral).

Acids vs. Bases: Ions

Acids yield H+; bases yield OH-.

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What are acids (definition)?

Aqueous solutions with H+ ions.

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What are acid properties?

Sour taste, corrosive, turns blue litmus red.

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What are bases (definition)?

Aqueous solutions with OH- ions.

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What are base properties?

Bitter taste, slippery feel, corrosive, turns red litmus blue.

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pH calculation formula

pH = -log[H+]

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pOH calculation formula

pOH = -log[OH-]

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pH and pOH relationship

pH + pOH = 14

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Study Notes

pH Scale Overview

  • pH scale measures acidity and basicity, ranging from 0 to 14.
  • Acidic solutions have a pH below 7, neutral solutions at pH 7 (pure water), and basic solutions above pH 7.

Hydrogen Ion Concentration

  • pH is determined by the concentration of hydrogen ions [H+].
  • Higher [H+] indicates a more acidic solution.
  • Logarithmic scale: each unit decrease in pH represents a tenfold increase in [H+].

Hydroxide Ion Concentration

  • Bases are characterized by the presence of hydroxide ions [OH-].
  • For acids: [H+] > [OH-]; for bases: [OH-] > [H+].
  • When [H+] = [OH-], the solution is neutral.

Acidity and Basicity

  • Acidic solutions yield more H+ ions in solution.
  • Basic solutions yield more OH- ions in solution.
  • Relationship between pH and pOH: pH + pOH = 14.

Definition of Acids

  • Aqueous solutions that contain H+ ions.
  • Stronger acidity corresponds to a higher concentration of H+.
  • Common acids include HCl, HNO3, vinegar, and citric fruits.

Properties of Acids

  • Sour taste and corrosive nature.
  • Turns blue litmus paper red.

Definition of Bases

  • Aqueous solutions that contain OH- ions; also called alkaline.
  • Common bases include NaOH, Ca(OH)2.

Properties of Bases

  • Bitter taste, slippery feel, and corrosive.
  • Turns red litmus paper blue.

Calculating pH

  • Formula: pH = -log[H+].
  • Example: 0.01M HCl has a pH of 2 because [H+] = 0.01M or 10^-2.

Calculating pOH

  • Formula: pOH = -log[OH-].
  • Relationship: pH + pOH = 14.
  • Example: For 0.01M NaOH, pOH is 2, thus pH = 12.

Quick pH Calculation Trick

  • Use 10^-x where x equals pH for acids; 10^-x where x equals pOH for bases.
  • For 0.001M solutions, the pH or pOH corresponds directly to the exponent.

Relationships Between pH, pOH, and Ion Concentrations

  • If pH = 4, then [H+] = 1 x 10^-4 M; corresponding calculations yield pOH = 10 and [OH-] = 1 x 10^-10 M.
  • For given [OH-], how to find pH: convert [OH-] to pOH, then calculate pH as pH = 14 - pOH.

Advanced Calculation Examples

  • Given [H+] = 1 x 10^-10 M, then pH = 10.0.
  • Given [OH-] = 1.80 x 10^-5 M, calculate pOH and then derive pH.

These notes provide a comprehensive understanding of acids, bases, and the pH scale, essential for chemistry studies.

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