my kf avg was 77m^-1 for 1) don\'t have to answer questions 2) or 4) ISCN lequil

Question

my kf avg was 77m^-1 for 1)

don't have to answer questions 2) or 4)

ISCN lequilib 1.0 x 10 4 0.481 10 4 M a 0.52 x 10-4 M Ktia calculated from these oonoentrations: Report the Kia and the average Ke for formation of the ironamythioyanate complex. the Discussion Questions and Problems 1. Uee the average of the Kis you found for solutiona Ba and B4 to test the validity of the assumption that we made for Rolution B1; namely that the thiocyanate ion present w nearly completely complexed. 2. Why would have it been difficult to obtain reliable reaults if the absorbanoea had been measured at 675 nm? 3. Explain how the method of continuous variations might be used to determine the atoichiometries of the following typee of reactions: a, an endothermic reaction between two Bubatances in Bolution. b, a reaction between two gaseous reactants to produce gaseous products where Ant o, e, a reaction between two strong electrolytes in solution to form a Boluble, nonionized product. 4. List the measurements you made in this experiment and the uncertainties associated wit these measurements. Use this information to calculate the uncertainty im the Keyou

Explanation / Answer

The method of continuous variation allows you to find the reaction stoichiometry or the optimal mole ratio at the which the reactants combine to form the products. For example consider a hypothetical reaction where:

xA + yB ------ Products

This method allows for the determination of the coefficients x and y by recording the change in a measureable property like color, temperature, precipitation etc which normally occur as various reactions proceed.

a) An endothermic reaction between two substances in solution:

Endothermic reaction is one in which heat is absorbed by the system, i.e the final temperature is lower than when the reaction begins. The two reactant solutions can be combined in different volume ratios keeping the total volume constant. Temperature can be measured before and after the reaction and the change in temperature can be noted. The volume ratio at which a maximum change (decrease) in temperature is observed corresponds to the optimal mole ratio of the reactants.

b) In the gas of two gaseous reactants, again these can be mixed in a series of varying volume ratios and the volume of the evolved gas can be measured. The highest volume of gas evolved corresponds to the optimal mole ratio.

c)

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.