Chemistry Homework Help

Chemistry
Tutor: None Selected Time limit: 1 Day

One step in the Kjeldahl method for measuring the amount of nitrogen in
organic compounds uses a dilute solution of boric acid, H3BO3, in water. 
If 150 mL of the boric acid solution contains 16.7 g of boric acid, what is the molarity?
Be sure to show ALL work, include units in your work as well as your answer.

Jun 3rd, 2015

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Jun 3rd, 2015

First you need to find number of moles of 16.7 g of boric acid.

Molar mass of boric acid is 61.83 g/mol

Number of moles = 16.7 g/61.83 g/mol = 0.27 moles

So, the molarity = 0.27 moles/0.15L = 1.8 M


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Jun 3rd, 2015

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