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April 19, 2014

Homework Help: chemistry

Posted by Martin on Monday, October 11, 2010 at 2:37pm.

URGENT!!

You wish to prepare 1 L of a 0.02 M potassium iodate solution. You require that the final concentration be within 1% of 0.02 M and that the concentration must be known accurately to the fourth decimal place. How would you prepare this solution? Specify the glassware you would use, the accuracy needed for the balance, and the ranges of acceptable masses of KIO3 that could be used.

(a) To make this solution (ideally) you would need ________ grams of potassium iodide dissolved in enough water to make up 1 L of solution.

fill in the blank

(b)What is the least accurate balance that could be used to make this solution?

1 - a mass spectrometer (accuracy = 0.2 g)
2 - an electronic balance (accuracy = 2 mg)
3 - a bathroom scale (accuracy = 2 kg) 4 - a kitchen scale (accuracy = 2 g)
5 - an analytical balance (accuracy = 0.2 mg)
6 - a triple beam balance (accuracy = 20 mg)

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