Chems 1 lab 1 Analysts of Vicamin C Report Sheet,Page 2 od 6 Calculate the vitam

Question

Chems 1 lab 1 Analysts of Vicamin C Report Sheet,Page 2 od 6 Calculate the vitamin C in the unknown. The excess l], is what is left over swerint: Use the thiosulfate molarity from Q#4, the average millimoles of exc some of the initial I has already reacted with the vitamin C In and determined by the 'back titration with s,o,2. Hint: Use the volume from Q#5 and reaction 2, Orcleyour answer determined by theareadyced wr onsumed in the reaction with the thiosulfate ion. In this part by the back titration with s,0,2. Hint: Use the thiosulfate molarity 1, 009 05 7. Calculate the difference between the initial millimoles of tr (0#2) and the excess ly from fron Q#6 This is ing to reaction 3. Circle your answer. the difference between the initial milli from Q#6 This is the our answer. millimoles of lr that reacted with the vitamin C in the unknown accord itial milli moles of Ir (Q les of 1 (Q #2) and the excess Ir 8. Calculate the milligrams of vitamin C in your unknown sample. Hint use the result from Q#7 and reaction 3. Circle your answer 9 Calculate the concentration of vitamin C in the unknown in mg of vitamin Cper 100 mL. Circle your answer 10. After you have completed al of the previous calculotions, complete the Lab 4 Accuracy Check assignment on Canvas. It must be completed by the first deadline (refer to the weekly schedule), or you will receive a score of 'o. If you repeat your accuracy check for any reason, after the first deadline, it will count as an additional attempt. Each additional attempt will reduce the maximum possible score by 1 point 20% 25% -259, your grade will be (1 attempt After completing the accuracy check, record the actual value provided by the instructor here a percent error in the space below nd calculate of mg/100 mL Unknown # actual value: 9.0 Lab 4: revised 4/23/2016 page 8 of 11

Explanation / Answer

Your work in question 6 through 8 is ok and correct. Folr the final step, all you have to do is divide the mg obtained of vitamin C, and do 1 of the 2 below:

1. If you have the total volume of the reaction, all you have to do is divide the mg between that volume and then, use a relation for 100 mL of solution. EXample, suppose the total volume of solution is 60 mL then:

C = 2.788x10-3 mg / 50 mL = 5.576x10-5 mg/mL
1 mL -----> 5.576x10-5 mg
100 mL ------> X
X = 5.576x10-3 mg/100 mL

2. If you don't have a total volume, then just divide the mass between 100 mL and you will have the concentration.

I don't see in your data the total volume of solution, (I can see the titration data but I can't see the innitial volume where the sample of vitamin C was dissolved that's why I can't know) But now that you know how to do it, try to do it. If you still have doubts, tell me in a comment and I'll help you out.

Hope this guides and helps you.

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