CHEM103LB_LAB3

CHEM103LB_LAB3 - LAB 3: THE REDOX ARENA Warm-Up Questions...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
LAB 3: THE REDOX ARENA Warm-Up Questions There are no warm-up questions for this lab. Procedural Summary
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Details/Steps (Part 1) Mass Table: Mass of Zn Mass of I 2 2.03g 2.03g Volume of 0.17M Acetic Acid: 5.0 mL Observation of Reaction: Step 6: As we swirled the “R” tube, there was a color change in the liquid from dark brown, to orange, lightening as the time increased. We took our “R” sample when the color was a pale yellow. After continuing to swirl, the temperature began to drop at 2 minutes, and the liquid turned clear. After 4 minutes, the sample was room temperature, and there was no solid visible in the solution. Step 11: We heard “crackling” sounds as the H 2 O was cooking off of the sample. There was some boiling, but we observed medium-gray solid granules forming in the bottom of the boiling tube. Steps 12 + 13: The pale yellow liquid cooked off, and a white precipitate “came out of nowhere” once the liquid was 90% gone. There was some crackling sounds observed as the remainder of the liquid was cooked off. R substance: Gray, granular solid, non-reflective, some white substance as well. Matched with granular Zinc. P substance: off-white granular solid. Matched with solid Zinc Iodide. Test Summary Test Gray Solid Color Liquid White Solid I 2 Crystals ZnI 2 Zn Zn 2+ I - I 2- I 3- Iodine (I 2 ) - - + + - - + Iodide ion (I - ) - + - - + - + Tri-iodide ion (I 3- ) - - + + - - + Zinc(II) ion (Zn 2+ ) - + - - + - + Zinc Metal + + - - + + -
Background image of page 2
Focus Questions (Part 1) 1. What happens qualitatively on both the macroscopic and atomic levels when zinc, iodine and water are mixed? Does a reaction occur? Zinc and Iodine do not react without the addition of water. In an aqueous solution, zinc and iodine react chemically to form Zinc Iodide (ZnI 2 ) in that aqueous solution. The atoms of Zinc and Iodine form an ionic bond, with Zinc(II) becoming attracted to two Iodide ions. The water can be removed via heat and we are left with a white solid. 2. If a reaction does take place, are the physical and chemical properties of the substances isolated during after the mixing the same as, or different from, those of iodine and zinc? Explain. From our lab, some of the physical properties are the same and some are different; some chemical properties are the same and some are different. The color of the Zinc Iodide is different (white, while Iodine is gray and Zinc is silvery), while ZnI 2 is as odorless as Zn is (I 2 has a pungent odor). ZnI
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

CHEM103LB_LAB3 - LAB 3: THE REDOX ARENA Warm-Up Questions...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online