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Salts 2 1. Dissolved salts are not the only solute that affects the pH of water. Gases may also dissolve in aqueous
solutions and affect the pH of the solution. For example, gaseous C02 can react with H20 and affect the pH of
the solution. Write the balanced chemical reaction that occurs. Use this reaction to describe why solutions of
distilled water will test slightly acidic. _ M +12.“ 0°11. ‘f My: 6-5 we“; J“ 4r) Hug” + ”391' 2. Suggest a method for removing dissolved C02 from distilled water. (Hint: Read Experiment 43C) 9 9
Buﬂ‘ers j 1
3. Use your own words to deﬁne the terms “equivalence point" and "endpoint". Be speciﬁc. Discuss the
difference between the two terms. Which was measured in this experiment? Provide a suggestion for how to
measure the other. 4-. Which of the following will buffer near pH = 9?
0.5 M sodium acetate / 0.5 M acetic acid
0.5 M ammonium chloride/0.5 M ammonia
c. 0.5 M sodium dihydrogen phosphate/0.5 M hydrogen phosphate bgho 52 ...
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- Spring '08