Intermediate Inorganic Lab

Satisfactory Essays
Intermediate Inorganic Lab

Experiment 1:

Preparation of Sodium Peroxoborate

The experiment is designed to form the salt of a peroxy acid (sodium

peroxoborate) from a salt (sodium borate) and hydrogen peroxide.

The chemicals needed for the experiment are as following: 4.75 g.

sodium borate, 1.0 g. NaOH, 5.75 mL of 30% sodium hydroxide, 12 mL of

0.1M HCl, 10 mL of 0.1N KMnO4, 0.2 g. KI, 5 mL of alcohol, and 5 mL of

ether. The only required equipment is a 150 mL beaker, 125 mm test

tubes, a Buchner funnel, filter flask, and an ice bath.

Prepare sodium metaborate by dissolving 4.75 g. of borax (sodium

borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may

take a while for the sodium metaborate to dissolve, so in the meantime

measure out 5.75 mL of hydrogen peroxide and chill in an ice bath.

Once the NaBO2 has completely dissolved, put the flask in the ice

bath. Dilute the chilled hydrogen peroxide with 15 mL of deionized

water. Slowly add the diluted hydrogen peroxide dropwise while

stirring. After all of the H2O2 is added, continue to stir for about

15 minutes. Filter the crystals by suction using a Buchner funnel and

wash with 5 mL of alcohol, then 5 mL of ether. Weigh the product.

Weigh out two 0.100 g. samples of the product and put each into a test

tube. Add 6 mL of 0.1M HCl to the first test tube, then 0.1M KMnO4 and

record results. To the

second test tube also add 6 mL of 0.1M HCl. Make a solution of 0.165

g. of KI in 10 mL of water. Add the KI solution dropwise to the test

tube and record results.

I started with 4.750 g. of borax, and produced 9.119 g. in product.

The product, NaBO3H2O, was a fine, white powder. My percent yield was

79.0%. In the section where you add HCl and KMnO4, the HCl dissolved

the solid and when the KMnO4 was added, the test tube was covered
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