Analysing; The Reaction of Hydrogen Peroxide and Iodide ions

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Skill 3: Analysing; The Reaction of Hydrogen Peroxide and Iodide ions

Table of Results

We calculate the concentration of I- ions by following these stages (taking the hypothetical value of experiment A)

Number of moles of KI contained         = volume x concentration

                                        = 5.0 x 10-3 x 0.1

= 5.0 x 10-4 moles

                                        = Number of I- ions contained in the solution

Concentration of solution                = number of mols

                                        Volume of solvent

                                        = 5.0 x 10-4 / (25/1000)

                                        = 0.02 mol/dm3

Thus I have calculated the other values, which appear on the table


Derived from the rate equation

Log (1/time) = n log (volume of KI) + constant

We can calculate the rate of reaction, by determining first, n, which can be obtained by calculating the gradient of the line on the following page.

Nevertheless, we would need to convert most of the data into logs,

Thus, we could derive the gradient of the graph, by drawing it, as seen upon the nest page.  

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We could also use the statistical method of finding the equation of the regression line, which is:

Y = a +bx (where y and x are the axis's)

B =         (xI - x)(yI - y)

(xI - x)2

a = y - Bx

Where  y = average of all y values

x = average of all x values

xI = x value

yI = y value

Therefore, when an equation is formed, we can mathematically derive the gradient, as the gradient of the graph, mathematically is the constant in front of x, providing y has no constants. ...

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