Identification- A: Infrared absorption B: Melting range: between 68 and 71C. Solution color-

Dissolve 1 g in alcohol, dilute with alcohol to 10 mL and mix (butylparaben solution). butylparaben solution). The solution is clear and has no color more intense than that of alcohol or a solution prepared immediately before use. of a solution prepared immediately before use by mixing 2.4 mL of ferric chloride SC, 1.0 mL of SC cobalt chloride and 0.4 mL of SC cupric sulfate with 0.3 N hydrochloric acid to obtain 10 mL, and diluting with 0.3 N hydrochloric acid to to obtain 10 mL, and diluting 5 mL of this solution with 0.3 N hydrochloric acid to obtain 100 mL. Compare by observing the solutions downward in paired color comparison tubes against a white surface. against a white surface. Acidity- To 2 mL of Butylparaben Solution prepared in the Solution Color test, add 3 mL of alcohol, 5 mL of water, 2 mL of water, and 2 mL of butylparaben solution prepared in the Solution Color test. of alcohol, 5 mL of carbon dioxide-free water and 0.1 mL of bromocresol green SR and titrate with 0.1 mL sodium hydroxide. with 0.10 N sodium hydroxide: no more than 0.1 mL is required to produce a blue color. Titration- To approximately 1.000 g of butylparaben, accurately weighed, add 20.0 mL of 1 N sodium hydroxide SV and titrate with 1.10 N SV sodium hydroxide. 1 N SV sodium hydroxide and heat to approximately 70C for 1 hour. Cool rapidly in an ice bath. ice bath. Perform titration of the solutions at room temperature. Titrate the excess of sodium hydroxide with 1 N SV sulfuric acid, continuing with the titration up to the second inflection point and determining the and determining the end point potentiometrically. Carry out a determination with a blank. Each mL of 1 N sodium hydroxide is equivalent to 194.2 mg of C11H14O3

1.- What is the quantity of butylparaben?

2.-Find the volume of sulfuric acid.