Lab Sample.docx - Determination of the Amount of Copper in...

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Determination of the Amount of Copper in Brass(Lab #2)Mosier 1AP Chemistry10/6/2016Pre-Lab Questions:
Part I:1.What are the name, formula and molar mass of the colored species being measured?
2.How do you propose to determine the value of your test tubes?
3.Why is it important to fill the cuvette ¾ full before inserting it into the colorimeter?
4.Explain how the graph (not shown) is used to determine the wavelength setting.
5.(a) What is the equation for the calibration plot?
(b) Determine the concentration for a sample that has an absorbance of 0.669.
0.669 = 2.465 * cc = 0.271MThis value was determined by plugging in known variables into the previouslydetermined formula and solving for the unknown variable.Part II:1.Write the balanced molecular equation for the reaction taking place with regard to thecopper in brass in this laboratory exercise.
2.Write the balanced net ionic for this reaction taking place in the laboratory exercise.
3.Assuming the shell casing is 100% copper, calculate the minimum volume of 8M nitricacid required to completely dissolve a 3.579g brass shell.

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Term
Spring
Professor
margaretgoscilo
Tags
Chemistry, English, Linear Regression, Nitric acid, Castillo

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