Question

If you have an equation for a line, y = 0.15x + 0.010, where y is absorbance and x is concentration in molarity of Fe (2+), calculate the concentration of a test sample with an absorbance of 0.065. What is

Answer 1

y = 0.15x + 0.010

y = 0.065 so
0.065 = 0.15x + 0.010. Solve for x.
0.065 - 0.010 = 0.055 = 0.15x so
x = 0.055/0.15 = ? M