q8key - 1 Chem 171 Quiz 8 Version A(Key Tit/Antacid Some...

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Chem 171 Quiz 8 Version A (Key Tit/Antacid) 1. Some automatic titrators measure the slope of a titration curve to determine the equivalence point. What happens to the slope that enables the instrument to recognize this point? Why is the center of the buffer region of a weak acid – strong base titration significant? Explain. At the equivalence point, the slope of the titration curve is at its maximum value. At the very center of the buffer region of a weak acid-strong base titration, the concentration of the weak acid and its conjugate base are equal, which means that at this point the pH of the solution equals the pK a of the weak acid. 2. The following questions pertain to the experiment entitled” Evaluating Commercial Antacids”. Define a back-titration. Write a molecular equation for the reaction of magnesium hydroxide with hydrochloric acid. Show the states. In a back-titration, a known excess of a standard reagent is added to the analyte. Then a second standard reagent is used to titrate the excess of the first reagent Mg(OH) 2 (s) + 2 HCl(aq) MgCl 2 (aq) + 2H 2 O (l) Chem 171 Quiz 8 Version B 1. Calculate the pH during the titration of 30.00 mL of 0.1000 M KOH with 0.1000 M HBr solution after the addition of 40.00 mL of acid.
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q8key - 1 Chem 171 Quiz 8 Version A(Key Tit/Antacid Some...

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