Four Lab Reports

CHEM182DL1_ReactionOrderandRateLaws_48408.pdf

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Student Name

Mohammed Alnaimi

Student ID 48408 Lesson Reaction Order and Rate Laws Institution Ocean County College Session 2019L3 CHEM 182 DL1 Course CHEM 182 DL1 Instructor Nancy Marashi

Final Report

Exercise 1

CHEM 182 DL1 Reaction Order and Rate Laws

Rate of Experiment 1= (k [HCl] [Na S O ] ) of Experiment 1 Rate of Experiment 2 (k [HCl] [Na S O ] ) of Experiment 2

(0.04 =k [0.6] [Na S O ] ) / ( 0.0017 = k [0.3] [Na S O ] )

Constants would be canceled on both sides:

2.35 = [2]

ln [2.35] = ln [2 ]

ln [2.35] = m* ln [2]

m = ln [2.35] / ln [2]

m= 1.23 = 1

1. Determine the reaction order for HCl using calculations described in the background section. Show your work. Note that your answer will probably not be a whole number as it is in the examples, so round to the nearest whole number.

m 2 2 3

n m

2 2 3 n

m 2 2 3

n m 2 2 3

Rate of Experiment 1= (k [HCl] [Na S O ] ) of Experiment 1 Rate of Experiment 2 (k [HCl] [Na S O ] ) of Experiment 2

0.033 =k [HCl] [0.18] 0.023 = k [HCl] [0.09]

Constants would be canceled on both sides:

0.143 = [0.5]

ln [0.143] = ln [0.5 ]

ln [0.143] = n* ln [0.5]

n = ln [0.143] ln [2]

n= 2.8 = 3

2. Determine the reaction order for Na S O using calculations described in the background section. Show your work. Note that your answer will probably not be a whole number as it is in the examples.

2 2 3

m 2 2 3

n m

2 2 3 n

m n m n

Rate = k [A] [B]

Rate = k [HCl][Na S O ]

3. Write the rate law for the reaction between HCl and Na S O .2 2 3

m n

2 2 3 3

Data Table 1: Varying Concentrations of HCl

Rate = k [F ] [CLO ]

k = Rate / [F ] [CLO ]

Using data from first set of experiment;

k = 0.3 / [0.5] [0.5]

k = 1.2

4. Using the following rate law and the experimental values given in the question f igures, calculate k:

[F ] (M) [ClO ] (M) Initial Rate (M/s)

Experiment 1 0.5 0.5 0.300

Experiment 2 0.8 0.8 0.768

Experiment 3 0.5 0.8 0.480

2 2

Measurement of quantity of reactants or products may be wrong and calculation of reaction time is also error prone.

5. Describe sources of error in this experiment.

Well #C1, D1

# of Drops of HCl 12

# of Drops of H O 02

# of Drops of Na S O 8

Concentration (M) of HCl Stock Solution

Concentration (M) of Na S O Stock Solution

0.3

Reaction Concentration (M) of HCl after Mixing in Well

Reaction Concentration (M) of Na S O after Mixing in Well

Trial 1 Reaction Time (sec)

Trial 2 Reaction Time (sec)

Average Reaction Time (sec)

Reaction "Rate" (sec )

Well #C2, D2

# of Drops of HCl 6

# of Drops of H O 6

# of Drops of Na S O 8

Concentration (M) of HCl Stock Solution

Concentration (M) of Na S O Stock Solution

0.3

Reaction Concentration (M) of HCl after Mixing in Well

Reaction Concentration (M) of Na S O after Mixing in Well

Trial 1 Reaction Time (sec)

Trial 2 Reaction Time (sec)

Average Reaction Time (sec)

Reaction "Rate" (sec )

2 2 3

0.60

2 2 3

0.12

24.5

-1 0.04

2 2 3

0.3

2 2 3

0.12

-1 0.017

Data Table 2: Varying Concentrations of 0.3 M Na2S2O3

Well #C3, D3

# of Drops of HCl 4

# of Drops of H O 8

# of Drops of Na S O 8

Concentration (M) of HCl Stock Solution

Concentration (M) of Na S O Stock Solution

0.3

Reaction Concentration (M) of HCl after Mixing in Well

Reaction Concentration (M) of Na S O after Mixing in Well

Trial 1 Reaction Time (sec)

Trial 2 Reaction Time (sec)

Average Reaction Time (sec)

Reaction "Rate" (sec )

2 2 3

0.2

2 2 3

0.12

107

101.5

-1 0.0099

Well #C4, D4

# of Drops of HCl 8

# of Drops of H O 0

# of Drops of Na S O 12

Concentration (M) of HCl Stock Solution

Concentration (M) of Na S O Stock Solution

0.3

Reaction Concentration (M) of HCl after Mixing in Well

Reaction Concentration (M) of Na S O after Mixing in Well

2 2 3

0.4

2 2 3

0.18

Trial 1 Reaction Time (sec)

Trial 2 Reaction Time (sec)

Average Reaction Time (sec)

Reaction "Rate" (sec )

Well #C5, D5

# of Drops of HCl 8

# of Drops of H O 6

# of Drops of Na S O 6

Concentration (M) of HCl Stock Solution

Concentration (M) of Na S O Stock Solution

0.3

Reaction Concentration (M) of HCl after Mixing in Well

Reaction Concentration (M) of Na S O after Mixing in Well

Trial 1 Reaction Time (sec)

Trial 2 Reaction Time (sec)

Average Reaction Time (sec)

Reaction "Rate" (sec )

Well #C6, D6

# of Drops of HCl 8

# of Drops of H O 8

# of Drops of Na S O 4

Concentration (M) of HCl Stock Solution

Concentration (M) of Na S O Stock Solution

0.3

30.5

-1 0.033

2 2 3

0.4

2 2 3

0.09

-1 0.023

2 2 3

Reaction Concentration (M) of HCl after Mixing in Well

Reaction Concentration (M) of Na S O after Mixing in Well

Trial 1 Reaction Time (sec)

Trial 2 Reaction Time (sec)

Average Reaction Time (sec)

Reaction "Rate" (sec )

0.4

2 2 3

0.06

-1 0.03