What is rate constant and what is specific rate constant?
1 Answer
Consider a simple reaction involving substance
Reactions tend to be fast at the beginning when concentrations are high and then slow down to zero when the reaction is complete.
If we measure the concentration of
(chemguideUK)
We can measure the rate of the reaction by measuring the gradient, or slope, of the line.
You can do this by drawing a tangent to the curve at a particular value of
You can see the line is steepest at the beginning showing that this is where the reaction is fastest.
If we plot the rate against the concentration of
A straight line like this means that rate is proportional to concentration:
We can replace the
The equation is referred to as the "rate equation" or "rate expression"
We can also write it like this:
The index
The specific rate constant is defined as the rate of reaction when all the concentrations are equal to 1.
If