For the indicated observations, explain the color changes observed. Refer to dir
ID: 516355 • Letter: F
Question
For the indicated observations, explain the color changes observed. Refer to directions under VI. Assingment 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 proprExplanation / Answer
K2CrO4 + H+ ------> K2Cr2O7
yellow orange
(alkaline) Acidic
chromate is yellow in color and dichromate is orange in color
b. when acid is added chromate is oxidized to orange dichromate. i.e eqm shift to right
c. when NaOH is adde, the acid is neutralized and eqm shift to left and yellow chromates are formed
d. when acid added again eqm shift to right and color become red
e. according to eqn written by you gain if water added eqm shift toward dichromate.
This is an example of le chateliers principle