TITLE:

PARTNERS:

OBJECTIVE:

ABSTRACT:

PROCEDURAL SUMMARY:

INITIAL RATE STUDY- Observations and calculations

INITIAL RATE STUDY - Analysis

Obs	[Co]* M	[Co] M	pH	[H+] M	rate A/sec	rate M/sec
Exp 1a
Exp 1b
Exp 2a
Exp 2b
Exp 3a
Exp 3b
Exp 4a
Exp 4a

* concentration based on mass measurements

RESULTS

Value obtained for m : __________

Value obtained for n : __________

Value obtained for k :            ±       

(remember units)

The rate law is:

PROGRESS CURVE - Observations

pH=              volume =              

Cobalt complex masses = Run1           Run2            

Absorbance at infinity = Run1           Run2            

time(sec), absorbance data

PROGRESS CURVE - Analysis

Regression analysis pH=3 remember units

Run 1

ln(At - A_) regression line (include plot)

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

1/(At - A_) regression line

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

Run 2

ln(At - A_) regression line

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

1/(At - A_) regression line

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

Unusual observations or analysis problems

PROGRESS CURVE - Observations

pH=              volume =              

Cobalt complex masses = Run1           Run2            

Absorbance at infinity = Run1           Run2            

time(sec), absorbance data

PROGRESS CURVE - Analysis

Regression analysis pH=2 remember units

Run 1

ln(At - A_) regression line (include plot)

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

1/(At - A_) regression line

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

Run 2

ln(At - A_) regression line

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

1/(At - A_) regression line

Correlation Coeficient =            

kobs =            ±            

constant =            ±            

A =           

Unusual observations or analysis problems

HALF LIFE MEASUREMENTS - Observations

pH=3

Run1 (At - A_)/2 = Time =

Run1 (At - A_)/4 = Time =

ÆTime =

Run2 (At - A_)/2 = Time =

Run2 (At - A_)/4 = Time =

ÆTime =

pH=2

Run1 (At - A_)/2 = Time =

Run1 (At - A_)/4 = Time =

ÆTime =

Run2 (At - A_)/2 = Time =

Run2 (At - A_)/4 = Time =

ÆTime =

kobs calculations

HALF LIFE MEASUREMENTS - Conclusions

State your conclusion about the order of this reaction.

The observed rate constants from half life

pH	Run1 kobs*	Run2 kobs*	Average kobs*	Uncertainty**

* units are:

** use spread/2 to estimate the standard deviation in the average kobs

Is their a significant difference between the kobs measured by regression analysis and the ones measured using half lives?

SUMMARY OF EXPERIMENTAL RESULTS

Attach your computer regression plots to this page.

Initial Rate Study

Value obtained for m : __________

Value obtained for n : __________

Value obtained for k :            ±       

Half-Life Study

Value obtained for m : __________

Value obtained for k :            ±       

Progress Curve

Value obtained for m : __________

Value obtained for k :            ±       

(remember units)

The chemical reaction associated with k is:

The rate law is:

CONCLUSIONS

Briefly discuss sources of error and any unusual results.