Practice Questions 1

Practice Questions 1 - 1.167 g/mL Find the molality(not...

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Analytical Methods (CHEM 207) Practice Questions 1: Wednesday, September 1, 2010 Name:____________________________________ 1. Name three types of systematic (determinate) errors.  I.____________________ II.___________________ III.__________________ 2. The density of concentrated ammonia ( 28.0% w/w  NH 3 ) is  0.899 g/mL . What volume of this reagent should be diluted  to make  500 mL  of  0.35 M  ammonia solution?  3. An aqueous solution of potassium iodide contains  20.1% w/w KI  and has a density of 
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Unformatted text preview: 1.167 g/mL . Find the molality (not molarity) of this solution. 4. A standard solution of K 2 Cr 2 O7 is known to have an absorbance of 0.640 at a given wavelength. Several aliquots of this solution were prepared to test the accuracy of a particular spectrophotometer. The following results were obtained: 0.639, 0.638, 0.639, 0.640, 0.640, 0.639, 0.638, 0.637 What is the accuracy of the instrument at the 99% confidence level?...
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