Posted: May 14th, 2023

KCTCS-CHE 104-A commercial vinegar was analyzed for % acetic

1. A commercial vinegar was analyzed for % acetic acid (CH3COOH). TenmL of vinegar was dispensed into a flask and 3 drops of phenolphthaleinsolution were added. The end-point was reached using 15.45 mL of 0.1988M NaOH. What is the M concentration and the % acetic acid in vinegar?2. Twenty five milliliters of a 0.50M barium chloride solution is mixed withequal volume and concentration of sodium carbonate solution. Theprecipitate formed is barium carbonate. If 1.8 grams of the precipitate isobtained, what is the percent yield of barium carbonate?3. An introductory chemistry laboratory class was asked to determine theempirical formula of the magnesium oxide that is formedwhen magnesium reacts with oxygen from the air. Give a brief procedureon how the class can determine the empirical formula of the synthesizedmagnesium oxide. Considering air composition, what is/are possible sideproduct/s and what can be included in the procedure to maximize theproduction of the desired product? Write the balanced chemical reactionfor the formation of the side product/s.Hint: The major product is waterinsoluble while the side product is water-soluble.The mass of 47.570 g piece of copper is measured three times ontwo different balances with the following results:4 pointsTrialBalance 1 (grams)Balance 2 (grams)145.74745.76245.74545.77345.74845.744.Calculate the average deviation for each set of measurements on eachbalance2 Which balance is more precise? Explain your answer.Which balance is more accurate? Explain your answer.15. An introductory chemistry student was asked to determine thepercentage of chloride in sea water. He was provided with asample of sea water, 0.10 M silver nitrate, quantitative filter paper,funnel, stirring rod, and volumetric pipets. Write the procedure,including the balanced chemical equation and detailed calculationsin determining the % chloride in the sample.6. The decomposition of group 2(X) carbonates is shown below:XCO3 (s) + heatXO(s) + CO2(g)Describe how you can experimentally determine the molecular formula of the oxide of X.Write detailed procedure including the data to be collected and the calculations todetermine the chemical formula of the carbonate.7. Given the following mixture (Fe filings, sulfur, glucose (a type of sugarthat's water- soluble) outline a systematic method of separating thecomponents and explain why those steps are the best and simplestmethod of separation technique that can be employed.8. 7.5 mL of potassium chloride solution was added to 50.745 g evaporatingdish. The dish and contents weighed 58.746 g. After evaporation, thedish and contents weighed 52.316 g.What was the mass % of potassium chloride in the solution?If the actual mass % of potassium chloride in the solution was 20.00%, whatwas the percentage error of the measurement?9. The following data were obtained from the experiment on Alka seltzer todemonstrate the concept of the limiting reactant and to determine the %of NaHCO3 in Alka Seltzer. Graph amount of vinegar vs % NaHCO3 andanswer the question:Volume of Vinegar (mL)% NaHCO3144.6548.81056.71557.92065.02557.43064.43562.863 What is the average % of NaHCO3 in the tablet?4 What is the limiting reactant? Explain.5 Write the balanced chemical equation for the reaction between sodiumbicarbonate and acetic acid ( CH3COOH)Use graph paper or excel to graph the data.You don't have to submit the graph(There's no software for graphing on Blackboard)

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