Chem 171 F10 Q9 Antacid Metal Key

Chem 171 F10 Q9 Antacid Metal Key - 1. Chem 171 Quiz 9...

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Chem 171 Quiz 9 Version A (Antacid Metal Key) 1. The following questions pertain to the experiment entitled” Evaluating Commercial Antacids”. Briefly explain why CaCO 3 would be a good source for a woman suffering from chronic heartburn. Use a net ionic equation to explain your answer. CaCO 3 tablets may well be prescribed for a woman with chronic heartburn. While serving as an antacid, they would also serve as a Ca 2+ ion. CaCO 3 (s) + 2 H + (aq) Ca 2+ (aq) + CO 2 (g) + H 2 O(l) or H 2 CO 3 (aq) 2. The following question is related to the experiment entitled “Reactivity of Metals”. A common way to make hydrogen gas in the laboratory is to place a metal such as zinc in hydrochloric acid. The hydrochloric acid reacts with the metal to produce hydrogen gas, which is then collected over water. Suppose a student carries out this reaction and collects a total of 154.4 mL of gas at a pressure of 742.00 mmHg and a temperature of 25 o C. What mass of hydrogen, in mg, did the student collect? Water vapor pressure is 23.78 mmHg at 25 o C. R = 0.0821 L atm/K mol, H =1.01. 742.00 Torr – 23.78 Torr = 718.22 Torr; 721.76 Torr x 1 atm/760 Torr = 0.945 atm n = PV/RT n=0.945 atm x 0.1544 L/0.0821 L atm/K mol x 298 K= 0.00596 mol H 2 0.00596 mol H 2 x 2.02 g / mol = 0.0120 g 0.0120 g x 1000 mg / g = 12.0 mg Chem 171 Quiz 9 Version B 1. The following question pertains to the experiment entitled” Evaluating Commercial
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This note was uploaded on 02/05/2012 for the course 160 171 taught by Professor Staff during the Spring '08 term at Rutgers.

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Chem 171 F10 Q9 Antacid Metal Key - 1. Chem 171 Quiz 9...

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