Determining the rate laws of the reaction between hcl and

Question

Reaction Order and Rate Laws

Lab Report Assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment's questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students' writing of lab reports by providing this information in an editable file which can be sent to an instructor.

Exercise 1: Determining the Rate Laws of the Reaction between HCl and Na₂S₂O₃

Data Table 1. Varying Concentrations of 1.0 M HCl.

				Concentrations
	# of drops	# of drops	# of drops	Stock Solution	Stock Solution	Reaction (after mixing in well)	Reaction (after mixing in well)	Reaction Time (seconds)			Reaction Rate (sec-1)
Well #	HCl	H2O	Na2S2O3	HCl	Na2S2O3	HCl	Na2S2O3	Trial 1	Trial 2	Average
C1, D1	12	0	8	1M	0.3M	.6	.12	30.76	32.90	31.83	.0314
C2, D2	6	6	8	1M	0.3M	.3	.12	35.10	38.11	36.61	.0273
C3, D3	4	8	8	1M	0.3M	.2	.12	46.23	47.79	47.01	.0213

Data Table 2. Varying Concentrations of 0.3 M Na₂S₂O₃.

				Concentrations
	# of drops	# of drops	# of drops	Stock Solution	Stock Solution	Reaction (after mixing in well)	Reaction (after mixing in well)	Reaction Time (seconds)			Reaction Rate (sec-1)
Well #	HCl	H2O	Na2S2O3	HCl	Na2S2O3	HCl	Na2S2O3	Trial 1	Trial 2	Average
C4, D4	8	0	12	1M	0.3M	.4	.18	22.47	22.02	22.45	.0449
C5, D5	8	6	6	1M	0.3M	.4	.09	49.44	50.76	50.1	.02
C6, D6	8	8	4	1M	0.3M	.4	.06	107.2	105.59	105.395	.0095

Questions

A. Determine the Reaction Order for HCl.

B. Determine the Reaction Order for Na₂S₂O₃.

C. Write the rate law for the reaction between HCl and Na₂S₂O₃.

D. Using the following rate law, and the experimental values given, calculate k:

RATE = k[F₂][ClO₂]

Experiment	[F2] (M)	[ClO2] (M)	Initial rate (M/s)
1	0.5	0.5	0.300 M/s
2	0.8	0.8	0.768 M/s
3	0.5	0.8	0.480 M/s

E. Describe sources of error in this experiment?