Chemistry 107 Lab Report 10

# Chemistry 107 Lab - -4(sample4 Calculations – Initial concentration of Fe 3 =[Fe 3 I = mL of[Fe(NO 3 3(x.0020 M ` mL Total ` =[Fe 3 I = 5 mL/10

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Egbuniwe Chinedum 1 Chemistry Lab report # 10 Summary For this lab we had to prepare four different solutions of Fe (NO 3 ) 3 , KSCN, and H 2 O. The quantities of each that we were to put were as follows: Then we were to create a standard solution of FeSCN 2+ by mixing 18 mL of .250 M Fe (NO 3 ) 3 and 2 mL of .0020M KSCN. We used it to calibrate the measurements for the other 4. After this we were to fill four cuvettes ¾ full of each solution in the table above and fill a fifth one the same way with the standard solution mentioned above. We then placed each cuvette into the calorimeter (with a cap on it) and collected the absorbance of each on the computer. Results Initial concentration of Fe 3+ = [Fe 3+ ] I = .001 Initial concentration of SCN = [SCN] - = .0004 (sample 1) ` = .0006 (Sample 2) ` = .0008 (Sample 3) ` = .001 (Sample 4)

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Egbuniwe Chinedum 2 [FeSCN 2+ ] eq = 3.92e -4 (sample1) ` = 5.65e -4 (sample2) ` = 7.48e -4 (sample3) ` = 9.26e
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Unformatted text preview: -4 (sample4) Calculations – Initial concentration of Fe 3+ = [Fe 3+ ] I = mL of [Fe (NO 3 ) 3 ] (x) .0020 M ` mL Total ` = [Fe 3+ ] I = 5 mL/10 mL (x) .0020 M ` = .001 Sample 1 Initial concentration of SCN = [SCN]- = mL of [KSCN] (x) .0020 M ` mL Total ` = 2 mL/10 mL (x) .0020 M ` = .0004 [FeSCN 2+ ] eq = A eq (x) [FeSCN 2+ ] std ` A std ` = .251/ 1.281 (x) .002 ` = 3.92e-4 Discussion – Egbuniwe Chinedum 3 From this experiment we can tell that the Initial concentration of Fe 3+ is .001. Because all of the quantities were 5 for this part the value is the same for all four samples. On the other hand SCN has four different quantities. The Initial concentration of SCN four all four samples are as follows: .0004, .0006, .0008, and .001. The equilibrium also has different values, in other words FeSCN 2+ eq is equal to 3.92e-4 , 5.65e-4 , 7.48e-4 , and 9.26e-4 for sample 1, 2, 3, and 4 respectively....
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## This note was uploaded on 11/10/2009 for the course CHEM 107 taught by Professor Generalchemforeng during the Spring '07 term at Texas A&M.

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Chemistry 107 Lab - -4(sample4 Calculations – Initial concentration of Fe 3 =[Fe 3 I = mL of[Fe(NO 3 3(x.0020 M ` mL Total ` =[Fe 3 I = 5 mL/10

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