Chem 171 F10 Q8 Tit Antacid Key

Chem 171 F10 Q8 Tit Antacid Key - 1. 2. Chem 171 Quiz 8...

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Chem 171 Quiz 8 Version A (Key Tit/Antacid) 1. A solution of malonic acid (a diprotic acid H 2 A), H 2 C 3 H 2 O 4 , was standardized by titration with 0.1000 N NaOH solution. If 23.95 mL of the NaOH solution were required to neutralize completely 10.00 mL of the malonic acid solution, what is the molarity of the malonic acid solution? Write the relevant molecular equation (include phases) (you can write H 2 A for malonic acid). H 2 C 3 H 2 O 4 (aq) + 2NaOH(aq) Æ Na 2 C 3 H 2 O 4 (aq) + 2H 2 O(l) Or: H 2 A (aq) + 2 NaOH (aq) Na 2 A(aq) + 2H 2 O(l) N NaOH = M NaOH 23.95 mL x 0.1000 mmol / mL = 2.395 mmol of base 2.395 mmol base x 1 mmol base / 2 mmol acid = 1.198 mmol acid 1.198 mmol acid / 10.00 mL = 0.1198 M acid 2. The following question pertains to the lab entitled “Evaluating Commercial Antacids”. Why is it that when you are titrating, you do not let a buret dry? Explain. What is the acid in gastric juice? If you let all the liquid run out through the tip, you run the risk of getting an air bubble trapped in the stopcock. Bubbles can impede the proper functioning of the buret or come out in the middle of a titration by making the volume inaccurate. Hydrochloric acid, HCl Chem 171 Quiz 8 Version B 1. The quantity of Cl in a water supply is determined by titrating the sample with Ag + . Write the relevant net ionic equation.
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Chem 171 F10 Q8 Tit Antacid Key - 1. 2. Chem 171 Quiz 8...

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