Potassium Bromate Lab Report

Results With Respect to Potassium Bromate(V)
The table below shows my results when varying the concentration of potassium bromate(V):



Concentration of Potassium Bromate(V) (mol/dm-3)
Time Take For the Mixture to Turn Colourless (seconds)



Trial 1
Trial 2
Trial 3
Trial 3
Trial 5
Average
Reaction Rate (seconds-I)


0.01
31.9 ±0.01
32.2±0.01
31.7±0.01
31.8±0.01
32.0±0.01
31.92±0.05
0.0313


0.008
45.6±0.01
45.1±0.01
45±0.01.3
45.4±0.01
45.2±0.01
45.32±0.05
0.0221


0.006
62.8±0.01
63.4±0.01
±0.0162.7
62.9±0.01
6±0.013.2
63.00±0.05
0.0159


0.005
88.8±0.01
88.3±0.01
89.0±0.01
88.5±0.01
88.7±0.01
88.66±0.05
0.0113


0.004

This is called the rate constant and its value changes with temperature. Using results of certain temperature I should be able to calculate a value for 'k'. Using the following values:
[Br03] = 0.008
[Br -] = 0.01
[H+]2 = (0.1)2 = 0.01
At room temperature, calculated reaction rate for the values are to be 0.0221 seconds-1. Substituting the above values into the rate equation in order to calculate the constant 'k', Firstly we need to rearrange the equation to make 'k' the subject:
Reaction Rate = k[Br03] [Br-] [H+]2 k = k = k =
!"#$%&'( !"#$ [!"!"] [!"!][!!]!
!.!""# (!.!!") (!.!") (!.!")
!.!""# (! ! !"!!)
k = 27625
The units for 'k' vary depending on the reaction investigated. In this case they are worked out as