Question

please answer all questions

The calibration curve and the calibration equation above was obtained by plotting absorbance Vs. [KMnO_4]. In the calibration equation y = 4.84E+03 x - 2.26E-01, what does y and x represent, respectively? If the absorbance of a KMnO_4 solution of unknown concentration is 0.833, calculate the concentration of KMnO_4 in the solution. Show your calculation.

Answer 1

1.

y is absorbance

x is molar concentration of $KMnO_4$

2.

$\\ \: \\ \: y = 4.84E+03x-2.26E-01 \\ \: \\ \: 0.833= 4.84 \times 10^{+03}x-2.26 \times 10^{-1} \\ \: \\ \:1.059 = 4.84 \times 10^{+03}x \\ \: \\ \:x =0.000219 \: M$

The molar concentration of $KMnO_4$ is 0.000219 M.