Chemistry Experiment

1. The solid cobalt (II) chloride crystals were dark purple, and the formula from the label of the stock bottle was:

c. The solution color was clear and slightly purple.

d. The solution was clear, purplish-pink with blue (teal) around the calcium chloride (solid).

e. The solution turned pink, opaque and foggy.

5. When the solution was heated, it turned dark blue. When it was cooled in the ice bath, it went back to its original color. It may have changed further if left longer in the ice bath but the experiment was just to see if the color change was reversible and it was.

1. The complex formula for cobalt (II) chloride from the stock bottle was:

2. The name for the type of compound that contains water molecules is a hydrate.

The cobalt chloride ionized in solution

The addition of excess chloride ions drove the reaction forward because more chloride ions were available to react with the cobalt

. . .
ation of 1.2x10-4 = 0.315 Change of 0.4x10-4 units = 0.129 absorbance 0.234 abosrbance = 47 units = 47/129 x 0.4x10-4 = 1.45 units Concentration = 9.45x10-5 M 4. The equilibrium concentrations for Fe3+ and SCN- were calculated for the mixtures in test tubes 2-5 in Part III. Test tube number 2 3 4 5 [Fe3+] 6x10-6 6x10-6 6x10-6 6x10-6 [SCN-] 4x10-6 6x10-6 8x10-6 1x10-6 Sample calculation: test tube 2: 3.00mL of a 0,002M solution of Fe(N03)3 = 0.3x.002 = 6x10-6 M 2.00mL of a 0.002M solution of SCN- = 0..2x.002 = 4x10-6 M, assuming all the SCN- forms FeSCN2+ 5. Calculation of keq for the reaction: Keq = [FeSCN2+] [Fe3+][SCN-] = The Kinetics of the Crystal Violet Reaction Introduction The purpose of this experiment was to look at the reaction between crystal violet and sodium hydroxide to study the relationship between concentrations of crystal violet and the time elapsed during the reaction. From the rate law for this reaction, the order with respect to cry
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Some common words found in the essay are:
GRAPH SETTINGS, TEMP CH3, III Test, TemperatureoC Rate, Processing Date, Shifts Data, Explanation Addition, Graphing Calculator, SCN- Concentration, Reaction Introduction, crystal violet, absorbance vs, data collection, chloride ions, rate constant, test tube, crystal violet solution, main screen, 100-ml beaker, reaction rate, distilled water, selected main screen, test tube 2, 3 4 5, cuvette slot colorimeter,
Approximate Word count = 1971
Approximate Pages = 8 (250 words per page)

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