This is my lab and I am very confused regarding the calculations! It is supposes to...

This is my lab and I am very confused regarding the calculations! It is supposes to demonstrate Le Chatelier’s principle.

After doing the following I need to calculate the molar absorbance for Co(H20)6 2+. The path length is 1cm and absorbance is .551. I got 5.51 L/mol *cm.

I also need to calculate the CoCl4 2- molar absorbance which I do not understand. The absorbance is .570 and the path length is 1cm. I do not know how to find the concentration.

1.Obtain a 10 mL graduated cylinder and three, 1 cm diameter spectrophotometer cells (cuvettes).

2. Fill one cuvette about ¾ full with deionized water. This cuvette will be used as the blank, to zero the instrument.

3. Fill a second cuvette about ¾ full with 0.10 M Co(NO3)2 .6H2O.

4. Prepare 100 mL of a 0.010 M Co(NO3)2 . 6H2O solution. Add exactly 10.0 mL of 0.10 M Co(NO3)2*6H2O to a 100 mL volumetric flask and dilute with deionized water to the mark.

5. Use the 10.0 ml graduated cylinder to prepare a solution of [CoCl4]2-. To the 10 mL graduated cylinder add 1.0 mL of 0.010 M Co(NO3)2 * 6H2O (prepared in step 4). Carefully pipette 4.0 mL of 12 M HCl into the graduated cylinder so that the total volume is 5 mL. Mix well.

6. Fill the third cuvette about ¾ full with the solution from step 5.

7. Obtain an equilibrium mixture from your instructor. This will be cuvette 4.

Solutions

Expert Solution

2nd page of answer

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

Hi I am working on my chemistry homework about acids and bases and I am confused...

Hi I am working on my chemistry homework about acids and bases and I am confused on this question from a lab. We used grape juice and cranberry juice and we had to put HCl and NaOH in the test tube full of juice. 1. Referring back to procedure 1 of the experiment, which of the two juices is more useful as a general pH indicator and why? I think it is grape juice but I just don't know what...

I am particularly confused regarding the number of degrees of freedom that should be used in...

I am particularly confused regarding the number of degrees of freedom that should be used in conducting the t-tests for the intercept and slope coefficients, and 95% associated confidence intervals. We are testing means (there are 6) so should there be t 4 degrees of freedom, level of significance 0.05 Is there any good explanations on the relationship between ANOVA and regression models. Are they the same? The data shown below are the 24-hour dissolution percentage results for a drug...

I am very confused about how to find the critical value of the test statistic. I...

I am very confused about how to find the critical value of the test statistic. I have found the test statistic of 5.636, with 1% significance level and two degrees of freedom. How do I calculate the critical value? Geneticists examined the distribution of seed coat color in cultivated amaranth grains, Amaranthus caudatus. Crossing black-seeded and pale-seeded A. caudatus populations gave the following counts of black, brown, and pale seeds in the second generation. Seed Coat Color black brown pale...

Can you please give a step by step for this as well? I am very confused...

Can you please give a step by step for this as well? I am very confused on the topic. 1. A currently employed woman, working for $40,000 per year is considering opening her own business. She estimates that renting a space will cost her $30,000 per year; hiring a part-time employee will cost her $20,000 per year; purchasing equipment will cost $70,000; and other out-of-pocket expenses will come to $30,000. She estimates that her total revenues will be $170,000 per...

Ok this is a exerpt from my lab. I prepared all my solutions correctly, and am...

Ok this is a exerpt from my lab. I prepared all my solutions correctly, and am getting ready to use the spectrophotometre. But is is asking for precise concentrations, and i am confused as two how to use the dilution formula M1V1=M2V2 to find them. Any advice would be appreciated. You should now have six “dilute” solutions containing known concentrations of tetraaquasalicylatoiron(III) ion in addition to the stock solution. The concentrations of these dilute solutions are approximately (assumes stock solution...

I am confused in my economics class. Why would allowing free trade be the most effective...

I am confused in my economics class. Why would allowing free trade be the most effective at boosting growth and living standards in a poor country over the long run? Please give a detailed explanation so I can really grasp the information.

I almost finished my pre-lab... but I am stuck! What are the energies of (-)-menthone and...

I almost finished my pre-lab... but I am stuck! What are the energies of (-)-menthone and (+)-isomenthone? How can I find this (how to do it)? Thank you for the help!

I am doing a lab and I get this error message in my unittest: junit.framework.AssertionFailedError: Hint:...

I am doing a lab and I get this error message in my unittest: junit.framework.AssertionFailedError: Hint: matches() should have returned true when item matches the item passed into IdLookup constructor. Here is my code. What changes should be made? /** * This class is a lookup that matches items whose id matches exactly * a specified id, to be passed into the constructor when creating * the instance of the lookup. * * @author Franklin University * @version 2.0 */...

Wondering if I am doing these calculations correctly I have a lab report due today. Questions...

Wondering if I am doing these calculations correctly I have a lab report due today. Questions Load P1 = 0 lb P2 = 350 lb P3 = 700 lb Gauge # Strain Stress Strain Stress Strain Stress 1 1102 724 383 2 1876 1546 1324 3 2177 2179 2181 4 876 1204 1558 5 662 989 1296 Sample Calculation: = s / e (10,600,000 psi)*1102 = 1.168 x 10^10 lb E = 10600 ksi = 10,600,000 psi

Hello, I am studying and I am a bit confused about registers. There are segments registers,...

Hello, I am studying and I am a bit confused about registers. There are segments registers, data registers, pointer registers, index registers. But I do not really understand where these are found. Are they found in 8086 architecture? For instance if I ask what type of registers are found in 8086 architecture what will be the answer? All of these or only segment registers?

Subjects