What is the saturation temperature of the salt when 4.00 g of KI is dissolved in

Question

What is the saturation temperature of the salt when 4.00 g of KI is dissolved in 3.00 mL of water? Studying the Rate of Reaction of Potassium Permanganate and Oxalic Acid 5.00 mL of oxalic acid with the concentration 1M have being placed in 25.00 mL flask. The flask has been filled with distilled water to the edge The content of the flask has been transferred into the bigger flask 1.00 mL of 0 2 M potassium permanganate have being added to this solution The elapsed time for the reaction is 245 s. Find the initial rate of the reaction. b) The reaction rate of SO_2 with H_2 at constant temperature and different initial reactant concentration is presented in the table below: Write the complete rate equation for the reaction.

Explanation / Answer

5. b) g of KI/100 g H2O = 4 g x 100 ml/3 ml = 133.33 g/100 g H2O

Saturation temperature from solubility curve = 8 oC (approx)

6. a) Initial rate for the reaction between oxalic acid and KMnO4

molarity of oxalic acid solution = 5 g/90 g/mol x 0.025 L = 2.22 M

oxalic acid is the limiting reagent

Initial rate = 2.22 M/245 s

                = 0.0091 M/s

b) from the given reaction data,

when the concentration of [H2] is kept constant and [SO2] is quadrupled, the rate of reaction increased twice. Thus the order with respect to [SO2] is 0.5

when the concentration of [SO2] is ketp constant while the [H2] concentrayion is halved, the rate also halved, so the reaction is first order with respect to [H2]

The overall rate law becomes,

rate = k[H2]/[SO2]

with, k being the rate constant

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