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University of California, Los Angeles *

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135

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Chemistry

Date

Jan 9, 2024

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pdf

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1

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Exercise 2: Gas and Reactions Data Table 2. Carbon Dioxide Reaction Observations Reaction Observations Calcium Carbonate was produced as a CalOH), + O, crystallized pnwdewzubsta nce O, +8BT8 Ayellow colored solution formed. €O, + Flame The flame was immediately extinguished Ca(OH), + Antacid/water gas €02 gas was formed. Antacid/water gas + Smoldering toothpick The toothpick flame went out. Awhite precipitate was formed and then moved Ca(OH). + Breath to the bottom of the test tube Questions: A) The chemical equation for the reaction of baking soda (sodium bicarbonate, NaHCO,) and vinegar (acetic acid, CH;COOH) may be written as two steps. Fill in the missing information for the chemical equation. Step1: __ NaHCO3 + CH3COOH, CHsCOONa(aq) + H,CO(l) Step 2: H,CO4(l) = H,0(l) + __ CO2, B) Write a chemical equation for the reaction of CO, and limewater (Ca(OH).). Write a physical description of the products formed. €02 + Ca(OH)2 = CaCO3 + H20 The calcium carbonate was a powdery substance, and the H20 is water which is a clear liquid. €) When the bromothymol blue (BTB) was exposed to the CO; gas, what color was the solution? Did the BTB indicate presence of an acid or base? Explain your answer. ‘The solution had turned a yellowish green. This means that the BT picked up the presence of an acid. Hence, an acid was present. D) Did the reaction between the antacid tablet and the tap water produce hydrogen, oxygen, or carbon dioxide gas? Support your answer with results from your work in both Exercise 1 and Exercise 2. Carbon dioxide gas was formed since the flame extinguished. E) Based on your observation of the reaction that occurred when limewater was exposed to Your breath, what gas did you exhale? Support your answer with your observations in Data Table 2. When limewater is exposed to carbon dioxide it turns a white color. Hence, | exhaled carbon dioxide.
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