Lab 7 halide ions - 2 Identity Ki Double unknown number 4...

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#4.4 Lab 7 Reactivity of Halide Ions Jennie Chang (even) Allison Yee (Partner- odd) November 4, 2010 EXTRA CREDIT
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Calculations: 1.Indicate the single unknown number. #2 2. Determine the identity of the single unknown. KBr 3. Include a few statements justifying your decision. The single unknown had the same reactions as KBr: It became a clear oil color as NaOCL and starch were added to it. 4. Indicate the double unknown number. #4 5. Determine the identity of the double unknown. NaCl+ KBr 6. Include a few statements justifying your decision. When the double unknown reacted with the AgNO3, the result was a milky white and yellow color. You could see that it was the same colors as NaCL and KBr, therefore we deduced that the double unknown was NaCL + KBr. Table of Results: Single unknown number
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Unformatted text preview: 2 Identity Ki Double unknown number 4 Identity NaCl+ KBr Discussion: This lab was very simple. My partner and I got through it very quickly. There weren’t many sources of error, however, 1) Out of carelessness, we stirred 2 different ions with the same toothpick. 2) It could have already had contamination from the previous period. 3) We put more than 5 drops by squeezing the dropper too hard. Conclusion: I learned that halide ions react differently with different reagents. My hypothesis was correct. Questions: 1. Which procedure confirms the presence of (a) Cl- ions, (b) Br- ions, and (c) I-ions. a) When you add AgNo3 and NH3 into the NaCl. b) All the halide ions being added to KBr. c) All the halide ions being added to Ki....
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