January 2013 Chemistry Regents #77-79

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  Base your answers to questions 77 through 79 on the information below.

The active ingredient in the pain reliever aspirin is acetylsalicylic acid. This compound can be produced by reacting salicylic acid with acetic acid. The label of one aspirin bottle indicates that the accepted mass of acetylsalicylic acid in each tablet is 325 milligrams.

In a laboratory, an aspirin tablet is crushed and mixed with water to dissolve all of the acetylsalicylic acid. The measured pH of the resulting solution is 3.0.

77 Write the chemical formula for the acetic acid. [1]

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HC2H3O2 or CH3COOH

78 State the color of methyl orange indicator after the indicator is placed in the solution. [1]

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red

79 The mass of acetylsalicylic acid in one aspirin tablet is determined to be 320. milligrams. Show a numerical setup for calculating the percent error for the mass of acetylsalicylic acid in this aspirin tablet. [1]

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((320mg-325mg)/325)   x 100

(-5)(100)/325

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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