Lab 21 Qualitative Analysis Paper
Name: Andre Davis
Lab Partner: Ariana camper
Title: Lab 21 Qualitative Analysis
Date: April 11, 2017
Objective: The goal for this lab was to take the unknown solution and determine its ions.
Experiment Procedure
Part 1 Group 1
10 drops of an unknown solution into a test tube. add four drops of 6M HCl, then stir it and place in centrifuge for 30seconds to a minute. Test for completeness of precipitation after testing for precipitation add one drop no more than one drop of 6 M HCl to the supernate. When the supernate turns cloudy means a few of the group 1 cations have precipitated. Add few more drops of the 6 M HCl, stir, then centrifuge. If necessary repeat the process until no more precipitate forms. take the precipitate and add 5 drops of water.
Separation and identification of Pb2+
Take the precipitate from the previous step and add fifth teen drops of water. Generate a hot water bath then place the test tube in it while stirring for about 45 seconds to a minute. Promptly centrifuge and transfer the heated supernate into a fresh test tube. Replicate the process a few more times and integrate the supernate. retain the precipitate for the testing of Ag+ if there was any. lastly add 3 drops of 1M K2CrO4 to the supernate. When a yellow precipitate forms then that confirms the presences of Pb
Identification of Ag+ …show more content…
When a precipitate forms then centrifuge and safely dispense the precipitate. Add seven drops of 0.1 M K2C2O4 and stir. If a pale white precipitate form that indicates the presence of ca2+. If no precipitate form rapidly, warm the test tube for a quick second in the hot water bath that you prepared and the take it out and let It cool. Then to get additional information for Ca2+ a flame test is recommended. Dissolve the precipitate in 6 M HCl and perform a flame test. A orangish color appears when the eraser is placed into the flame would be characteristic as
Lab Partner: Ariana camper
Title: Lab 21 Qualitative Analysis
Date: April 11, 2017
Objective: The goal for this lab was to take the unknown solution and determine its ions.
Experiment Procedure
Part 1 Group 1
10 drops of an unknown solution into a test tube. add four drops of 6M HCl, then stir it and place in centrifuge for 30seconds to a minute. Test for completeness of precipitation after testing for precipitation add one drop no more than one drop of 6 M HCl to the supernate. When the supernate turns cloudy means a few of the group 1 cations have precipitated. Add few more drops of the 6 M HCl, stir, then centrifuge. If necessary repeat the process until no more precipitate forms. take the precipitate and add 5 drops of water.
Separation and identification of Pb2+
Take the precipitate from the previous step and add fifth teen drops of water. Generate a hot water bath then place the test tube in it while stirring for about 45 seconds to a minute. Promptly centrifuge and transfer the heated supernate into a fresh test tube. Replicate the process a few more times and integrate the supernate. retain the precipitate for the testing of Ag+ if there was any. lastly add 3 drops of 1M K2CrO4 to the supernate. When a yellow precipitate forms then that confirms the presences of Pb
Identification of Ag+ …show more content…
When a precipitate forms then centrifuge and safely dispense the precipitate. Add seven drops of 0.1 M K2C2O4 and stir. If a pale white precipitate form that indicates the presence of ca2+. If no precipitate form rapidly, warm the test tube for a quick second in the hot water bath that you prepared and the take it out and let It cool. Then to get additional information for Ca2+ a flame test is recommended. Dissolve the precipitate in 6 M HCl and perform a flame test. A orangish color appears when the eraser is placed into the flame would be characteristic as