Lab 10.docx - Alyssa Sumner Paul Buckley Chemistry 106 Lab...

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Alyssa Sumner Paul Buckley Chemistry 106 Lab 10 November 2019 Known Anions (Lab 10) 1. In this experiment we observed different chemical properties of anions in order to know how to do our next lab which would be unknown anions. We did this by completing a series of chemical test completed on our anions. Each reacted different to the test but most did not have much of a reaction at all, nevertheless this would show a pattern that would soon become useful in determining unknown anions. We did this with four different tests; the first one would be a combination with silver nitrate to see if it forms a precipitate, the second test was with calcium and barium to see if they formed a precipitate, test three was with permanganate ion to see if it would change color, the fourth test was with 18M sulfuric acid to see if any change in weather it was a base or an acid and if the gas was volatile or not. For test one we would put 10mL of our working solution with ½ a mL of 3M sulfuric acid, add three drops of silver nitrate, wait for reaction, then add ½ a mL of ammonia and centrifuge the anions to see if a precipitate would form. Test two I put about 1 mL of working solution into two small test tubes with ½ mL of ammonia in both and ½ mL of calcium in one, barium in the other, I then stirred the solution and waited for a precipitate to form. Test three we added 1mL of working solution with about ½ mL of 3M sulfuric acid, I then added roughly 2 drops of potassium permanganate, stirred and waited for any change in the anions. Test four I used a sample dish and placed one small scoop of each of my anions in solid form (in separate dishes at different
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