reaction order
I know the form is r=k(A)a(B)b (a, b are exponents)
and I know a and b depend on the concentration, but how do i know the number a and b.
can you please explain in your own words instead of giving me websites because i look and i'm still confused
I also tried to post an example, but it wouldn't let me submit my question because it is reading it as a website.
I know the form is r=k(A)^a(B)^b
and I know a and b depend on the concentration, but how do i know the number
For example, 2NO3+2H2>N2+2H2O
r=k[NO3]^2[H2]^1 and 2+1=3 making it a third order equations.
I wish I knew what your question was. Explain what?
the reaction order respect to one reactant.
r is for rate=k(A)^a(B)^b
if you look online, it will tell you but i'm not sure i understand it.
For example, 2NO3+2H2>N2+2H2O
the above reaction is a third order question because a=2 and b=1 which is three. a and b are not the numbers before the formulas.
The reaction orders are determined experimentally. They may or may not be the same as the coefficients in the balanced equation. In the nitrate reaction you cite, the one to the second order has an exponent of 2, the other one is a first order, together they are 2+1 = third order overall.
Certainly! In a chemical reaction, the reaction order determines how the rate of the reaction changes with respect to the concentrations of the reactants. The reaction order is represented by the exponents "a" and "b" in the rate equation: r = k(A)^a(B)^b.
To determine the reaction order, you typically need experimental data from different reaction conditions. Here's a step-by-step approach to finding the reaction order for a particular reactant:
1. Choose a reactant, let's say reactant A, and keep the concentration of reactant B constant.
2. Conduct a series of experiments where you vary the concentration of reactant A while keeping all other factors constant. You can select different concentrations and record the corresponding reaction rates for each experiment.
3. Plot the reaction rates on the y-axis against the concentrations of reactant A on the x-axis. This graph is known as a rate-concentration plot.
4. Analyze the graph to determine the relationship between the concentration of reactant A and the reaction rate. Look for trends such as a straight line or a curve.
- If the graph is a straight line passing through the origin (0,0), the reaction order with respect to reactant A is 1 (a = 1).
- If the graph is a straight line that does not pass through the origin or a curve that levels off, the reaction order is positive but not equal to 1 (a > 1).
- If the graph is a curve that increases rapidly at first and then levels off, the reaction order is between 0 and 1 (0 < a < 1).
5. Repeat the same process by varying the concentration of reactant B while keeping the concentration of reactant A constant. This will help you find the reaction order for reactant B based on the same principles as step 4.
By conducting experiments and analyzing the rate-concentration plots, you can determine the reaction orders (values of "a" and "b") for each reactant in the rate equation.
I hope this explanation helps you understand how to determine the reaction order in a chemical reaction. If you have any further questions, feel free to ask!