For each of the indicated pbservations, explain the color changes observed. Refe

Question

For each of the indicated pbservations, explain the color changes observed. Refer to VI. Assignment before giving your explanations.

BR M AND LE CHAT ELIE R S PR c PLE (d) Add 10 drops of 3 M H so Mix. Note the color. (e) Add 4 mL of DI water. Mix. Note the color 3. Calcium oxalate Note the specific quantities of precipitate p in each step a) Mix 1 L of 0.1 M CaCl with 2 mL of DI water in your six ch test tube. (b) Add 10 drops of 0.5 M H,CO, solution. Mix. Note your observations. c) Add 10 drops of 6 M HCl to the mixture from b and mix. Note your tions. (d) In the hood, add a sligl 12 drops) of 6 M NH, to the mixture from c) and mix. 4. Tekraammine Copper Complex lon Equilibrium (a) obtain 2 mL of 0.1 M Cuso solution in your graduated cylinder. Note the color. Divide the solution into two six-inch test tubes. b) To both test tubes, in the hood, add 1 drop of 6 M NH, Mix Precipitation should occur. (c) To one, in th hood, add 5 drops more of 6 M NHL solution. Mix. Note your rvations. d) To tube from (c), ac 10 drops of 6 M HC. Mix. Note your observations. (e) To the second tube from (b), carefully add 5 dro ps of 6 M HCI solution. Mix Note your observations STUDENTSARETO PLACE ALLTHE WASTES INTO THE PROPER WASTE CONTAINER IN THE LABORATORY VI. ASSIGNMENT Underneath your recorded observations o the following pages, you will be asked to write the appropriate equilibrium equation and to explain your observations. The ex nation of your observations musi include the direction ofany eguilibrium shift, why it shifted in that direction, and how that led to your observation When a competing propr

Explanation / Answer

b) Absorbs blue-green light and gives out red color
c) SCN- is usually colorless , when Fe3+ which is in yellow color combines with SCN- it gives away
   [FeNCS]+2 complex which is deep red in color, [shows up the complementary color]
d) It generally forms Fe(OH)3 red ppt but since diluted mixture is used the color just reduces to clear yellow
e) Since the diluted mixture of Fe(NO3) is mixed with H2O the clear precipitate is not formed, this unclear
   precipitate Fe(OH)3 which displays partial red color combines with yellow to give clear orange.

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