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Acid/Base Unit REVIEW ANSWERS

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**Practice defining acids and bases.**

WORTH YOUR TIME? 16 pts on 100 pt. test Looking at the formula Al(OH)3, we would assume that this is a base this has a pH of 7 this is an acid the concentration is stable According to the Bronsted-Lowry model, an base is a(n) H+ acceptor proton donor H+ ion producer OH- ion producer none of these Which represents a conjugate acid-base pair? H2O, H3O+ OH-, HNO3 H2SO4, SO42- HC2H3O2, C2H3O2- Identify the acid, base, conjugate acid, and conjugate base. H2SO4 + H2O --> H3O+ + HSO4- A B CA CB NH3 + H2O --> OH- + NH4+ B A CB CA

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**Differentiate between strong acid and weak acid.**

Individually: Read the following statement: Acids dissociate in water to form H+ ions. Some acids dissociate more readily than others. Strong acids dissociate completely to form the most H+ ions possible; while weak acids only dissociate partially. With your Partner: Where did you hear “strong acid” or “weak acid” used in this unit? Choose the correct answer: Solid hydrogen sulfate partially dissociates when added to water to produce an aqueous solution of HSO4- and H3O+. Therefore, sulfuric acid is a strong acid weak acid conjugate acid none of these

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**Understanding the Kw equation**

Individually: Write the kw equation. 1.0x10-14 = [H+][OH-] Write a sentence that explains when this equation should be used. With your Partner: Check your equation. Compare your explanations of the usefulness of this equation. Worth your time? 14 pts to 30 pts on 100 pt test

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**Understanding the pH equation**

Individually: Write the pH equation. pH = -log[H+] Write a sentence that explains when this equation should be used. Fill in the blanks: The pH scale goes from 0 to 14. Acids have a pH below 7, and bases have a pH above 7. With your Partner: Check your equation. Compare your explanations and answers to the fill in the blank statement. Worth your time? 21 pts on 100 pt test

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**Understanding the pOH equation**

Individually: Write the pOH equation. pOH = -log[OH-] Write a sentence that explains when this equation should be used. How is the pOH equation different from the pH equation? With your Partner: Check your equation. Compare your explanations. Worth your time? 16 pts on 100 pt test

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**Understanding the relationship between pH and pOH**

Individually: pH + pOH = 14 Write the equation that includes both pH and pOH. Write a sentence that explains when this equation should be used. With your Partner: Check your equation. Compare your explanations. Worth your time? 16 pts on 100 pt test

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**Practice Kw, pH, and pOH calculations.**

Check your answers to yesterday’s handout. Solve. During the course of the day, human saliva varies between acidic and basic. What is the [H+] in saliva if [OH-] is 3.16x10-8M? What is the pH of the saliva? At this point in the day, is it acidic, basic, or neutral? [H+] =3.16x10-7 M, pH = 6.5, acidic What is the concentration of OH- ions in 0.1M bicarbonate of soda if [H3O+] is 3.98x10-9M? Is the bicarbonate acidic, basic, or neutral? What is the pH? What is the pOH? [OH-]=2.51x10-6M, pOH=5.6, pH=8.4, basic What is the concentration of H3O+ ions in eggs if [OH-] is 6.0x10-7M? Are eggs acidic, basic, or neutral? [H+] = 1.67x10-8 M, basic If the pH of a solution is 6.4, what is the [OH-]? [OH-] = 2.51x10-8 M Find the [H+] and [OH-] of a solution with a pH of [H+] = 3.2x10-4 M, [OH-] =3.1x10-11 M For each pair of concentrations, tell which represents the more acidic solution. [H+] = M or [OH-] = M [H+] = 1.03x10-6 M or [OH-] = 1.54x10-8 M

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**Understanding titrations**

Individually: Fill in the blanks. Every time that an acid and a base react in a neutralization reaction, a salt and water are produced. Solve: A volume of 20-mL of 0.25M Al(OH)3 neutralizes a 75-mL sample of H2SO4 solution. What is the concentration of the acid? 2Al(OH)3 + 3H2SO4 6H2O + Al2(SO4)3, Acid M = 0.1 M Solve: Calculate how many milliliters of 0.30M H2SO4 must be added to titrate 75 mL of 0.10 M KOH. H2SO4 + 2KOH 2H2O + K2SO4, L or 25mL of acid With your Partner: Check your fill in the blank statement. Compare your balanced equations with your partner. Compare your work and answers to the two calculations. NOTE: IF SOMEONE HAS TOLD YOU ABOUT A SHORT-CUT (MAVA = MBVB), FORGET IT. IT DOES NOT WORK CONSISTENTLY. Worth your time? 10 pts on 100 pt test

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Chapter 15 Acid-Base Titrations & pH

Chapter 15 Acid-Base Titrations & pH

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