Section: Date: Concudraf ion. An Data Sheet 1. Concentration of Hacao. solution,

Question

Section: Date: Concudraf ion. An Data Sheet 1. Concentration of Hacao. solution, M 2. Concentration of KMnoe solution, M 0.13 M 3. Room temperature, c Elapsed time, s Determination LH.Co. mL KMnos. mL LD H20. mu Temp LElapsed time, s SmL ImL. Do calculations 1, 2, per determination. For determinations 1-3. (volume solution added,L concentration of KMnou, M) total volume of murture, 1. Initial KMnoe concentration, 2. Initial Hzczo, concentration, Ma solution added,L concentration of Hacao.M) 3. Reaction rate total volume of mixturel 4. Reaction order of H2Croa, x To solve for x, choose 2 determinations where [Hacizoel is changing and that of KMnoel is kept the same. Follow the example as shown in the background. 5. Reaction order of KMnoa, y To solve for y, choose 2 determinations where [KMnod is changing and that of [Haczolis kept the same. Follow the example as shown in the background. 6, Overall reaction order y 7. Rate constant, k To solve for k, substitute for the values of rate, IHrcaoul, (KMnoal from any experiment in the general equation. Follow the example as shown in the background. 8. Rate equation e k .Do calculation 9 per determination. For determinations 4-5.

Explanation / Answer

PRE-LAB QUESTIONS:

1)

Moles of NaOH = Mass/MW = 4/40 = 0.1

Volume = 5 mL = 0.005 L

So molar conc = moles/volume = 0.1/0.005 = 20M

2)

When 4 mL is diluted to 500mL, it corresponds to a dilution by a factor of 500/4 = 125 times

Thus, final conc. is reduced 125 times

Final conc = 20/125 = 0.16 M

3)

4 = (0.2)x / (0.1)x

4 = (0.2/0.1)x

4 = 2x

22 = 2x

Thus, x = 2

POST LAB QUESTIONS:
1)

Increasing the temperature increases the reaction rate, by a factor of 2 for every 10'C rise in temperature

2)

The rate constant of a reaction changes when we change the temperature.

On increasing the temp by 75'C above rrom temp, the reaction rate constant 'k' would also increase.

This is because rate constant is related to temp T as follows:

k = Ae-(Ea/RT)

So, increasing T also increases k.

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