Nernst Equation plotting in MATLAB

Question

Shay 2020-5-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/536379-nernst-equation-plotting-in-matlab

评论： Ameer Hamza 2020-5-28

I am unable to plot an Eout1 vs pH graph for changing quantities of Temperature and pH values.The code is:

%Constant Temperature and Changing pH
pH = 0:14;%pH Value
T = 300;% Temperature value in Kelvin
R = 8.3145;% Gas Constant
n = 1;% Number of moles
F = 96485;% Faradays Constant
E0 = 30e-3% Standard Cell Potential
Eout = -(E0 - (R*T/n*F)*pH)/1.0e+09 %Modified Nernst Equation
plot(pH,Eout)%plot firts graph
%Changing pH and Changing Temperature
T1 = 294:307;%Temperature Range
Eout1 = -(E0 - ((T1*R)/n*F)*pH)/1.0e+09
hold on
plot(pH,Eout1)

The first Eout vs pH graphplots fine. However, the Eout1 vs pH graph displays the error message:

Error using  * 
Inner matrix dimensions must agree.

I did try using "." operator in some combinations still no resolve.

Any ideas on solving this?

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Answer 1

Ameer Hamza 2020-5-28

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在 MATLAB Online 中打开

Try this code, I changed the range of T1 and used element-wise operator in the equation for Eout1

%Constant Temperature and Changing pH
pH = 0:14;%pH Value
T = 300;% Temperature value in Kelvin
R = 8.3145;% Gas Constant
n = 1;% Number of moles
F = 96485;% Faradays Constant
E0 = 30e-3% Standard Cell Potential
Eout = -(E0 - (R*T/n*F)*pH)/1.0e+09 %Modified Nernst Equation
plot(pH,Eout)%plot firts graph
%Changing pH and Changing Temperature
T1 = 294:308;%Temperature Range % <===== changed range here
Eout1 = -(E0 - ((T1.*R)./n*F).*pH)/1.0e+09 % <===== used element wise operators.
hold on
plot(pH,Eout1)