Adapted by Nelson Nuñez-Rodriguez
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By David W. Ball
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| QUESTION | ANSWER |
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1. Write the balanced chemical equation between Zn metal and HCl(aq). The other product is ZnCl2. |
1. Zn + 2HCl → ZnCl2 + H2 |
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3. Why isn’t an oxide compound like CaO considered a salt? (Hint: what acid-base combination would be needed to make it if it were a salt?) |
3. The O2− ion would come from H2O, which is not considered a classic acid in the Arrhenius sense. |
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5. Write the balanced chemical equation between aluminum hydroxide and sulfuric acid. |
5. 2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O |
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7. Write the equation for the chemical reaction that occurs when caffeine (C8H10N4O2) acts as a Brønsted-Lowry base. |
7. C8H10N4O2 + H2O → C8H10N4O2H+ + OH−; the H+ ion attaches to one of the N atoms in the caffeine molecule. |
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9. Can an amphiprotic substance be a strong acid and a strong base at the same time? Explain your answer. |
9. As a strong acid or base, an amphiprotic substance reacts 100% as an acid or a base, so it cannot be a base or an acid at the same time. |
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11. Under what conditions will the equivalence point of a titration be slightly acidic? |
11. if the salt produced is an acidic salt |
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13. Write the chemical equation for the autoionization of NH3. |
13. NH3 + NH3 → NH4+ + NH2− |
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15. What is the pOH range for an acidic solution? |
15. pOH > 7 |
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17. The concentration of commercial HCl is about 12 M. What is its pH and pOH? |
17. pH = −1.08; pOH = 15.08 |