The concentration of the dye at the absorbance of 0.25 = 1.76x10⁻⁵M
The regression equation says
y = 15200x - 0.018
with y = 0.25
y is the absorbance and x is the concentration
We have to put in the value of y to get the concentration x
y = 15200x - 0.018
0.25 = 15200x - 0.018
0.25+0.018 = 15200x
0.268 = 15200x
x = 0.268/15200
= 1.76x10⁻⁵M
The concentration of the dye at the absorbance of 0.25 = 1.76x10⁻⁵M
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