ore beginning this experiment in the laboratory, you should be able to answer th

Question

ore beginning this experiment in the laboratory, you should be able to answer the following questions. A 0.150 g sample of KIO, required 9.80 mL of Na,S,O, solution for its standardization. What is the molarity of the Na S,O, solution? 2. Suggest how chloroform helps preserve the water sample. 3. Which species is being oxidized and which is being reduced in the following reaction? 4. During the course of the standardization of S,0, with KIO,, the text tells you to ignore the return of the blue color with time after the end point has been reached in the reaction. Suggest a reason for the return of the blue color. Write a chemical reaction that is consistent with your suggestion. 5. Calculate the concentration in mg/L (ppm) of a solution that is 4x10 M in O2, assuming a density of 1 g/mL for the solution. 545 Copyright C 2015 Pcarson Education, Inc

Explanation / Answer

1. Molarity = moles of solute/Volume in L

Moles = mass/molar mass

Mass of KIO3 = 0.150g

Molar mass = 214g/mol

Moles of KIO3 = 0.150g/214g/mol = 7.0*10-4moles

Volume = 9.80mL = 0.0098L

Molarity = 7.0*10-4 moles/0.0098L = 0.071M

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