LAB 5: ASPIRIN SYNTHESIS Note that the carboxylic acid group remains intact duri
ID: 1027168 • Letter: L
Question
LAB 5: ASPIRIN SYNTHESIS Note that the carboxylic acid group remains intact during the course of the reaction, thus aspirin can still be irritating to some stomachs. This effect can be reduced by the use of buffering agents. Buffering agents help to control the pH (acidity) of solutions. PRE-LAB QUESTIONS 1. Sodium hydroxide reacts with carbon dioxide to produce sodium carbonate and water. a. Write the balanced chemical reaction: b. If 68.0 g of sodium hydroxide and 44.0 g of carbon dioxide are allowed to react, which is the limiting reactant and what is the maximum mass of sodium carbonate that can produced? 2. When hydrogen sulfide gas is bubbled into a solution of sodium hydroxide, the reaction forms sodium sulfide and water. How many grams of sodium sulfide are formed if 2.00 g of hydrogen sulfide is bubbled into a solution containing 2.00 g of sodium hydroxide, assuming that the sodium sulfide is made in 92.0% yield?Explanation / Answer
1. a)2NaOH + CO2 ----> Na2CO3 +H2O
b) no.of moles of NaOH is 68/40 = 1.7moles
no.of mols of CO2 = 44/44 = 1mole
Since, 2 moles of NaOH is consumed for every 1 mole of CO2 consumed , NaOH is limiting reagent.
Since,it reacts at a faster rate.The above reaction is a stoichiometric reaction,for every mole of CO2 consumed, a moleof Na2CO3 is produced. Here, a maximum of 1 mole of CO2 is consumed, so 1 mole of Na2CO3 is produced.
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