if while preparing solutions A in Part One, the solution in the pipet turns brow
ID: 900059 • Letter: I
Question
if while preparing solutions A in Part One, the solution in the pipet turns brownish red, explain what has happened and why it is necessary to repeat the preparation of the test tube? (included my results and the preparation) 3- 18 x 150 mm test tubes 5 cuvettes 2- 50 mL beakers 600 mL. beaker glass stirring rod PROCEDURE WASTE DISPOSAL: This experiment uses low toxicity materials which can go down the sink once the solutions are neutralized. During the experiment, pour all waste int 600 mL beaker. After the experiment, put the beaker in the sink and, with stirring, sprinkle solid NaHCOs into the solution. When the fizzing stops, pour the solution down the drain with running water. o a PART ONE:CALIBRATION LINE PREPARATION 1. Place five 18 x 150 mm test tubes in a test tube rack and clearly label them A through E using a grease pencil. 2. Obtain 60 ml of the 0.200 M Fe(NOs)s solution in a 100 mL beaker, 20 mL of 9.00 x 10 M KSCN in 50 mL beaker and 40 mL of 0.500 M HNO in a 50 mL beaker 3. Carefully pipet the correct amount of 0.500 M HNO, into all test tubes as designated in 4. Carefully pipet the correct amount of 9.00 10+M KSCN into all test tubes as designated 5. Carefully pipet the correct amount of 0.200 M Fe(NO)s into all test tubes as designated 6. Once all reagents are added, cover the test tubes with parafilm and mix to obtain a Test tube ml. of 0200 M mL. of 9.00 x 10 M mL of 0.500 M 1000-0.00 the table shown on the next page. Then clean out the pipet. below. Then clean out the pipet below. Then clean out the pipet. homogeneous color. Solution A is the "blank" mL of 0.200 M Fe(NO3) KSCN HNO3 10.00 8.00 7.00 6.00 5.00 A (Blank) 2.00 3.00 4.00 5.00 10.00 10.00 10.00 7-4 CHEM1515-YEAR 2015-2016Explanation / Answer
If at any time during the preparation of the mixtures a solution in a Mohr pipet turns brownish red, then the pipet is
contaminated. It must be cleaned and the solution for that test tube prepared again.
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