Mapa Sapling Learning macmillan learning Suppose you generate the following spec
ID: 228486 • Letter: M
Question
Mapa Sapling Learning macmillan learning Suppose you generate the following spectroscopic data with five solutions of known concentration. What is the slope of the linear regression line formed by these points? Absorbance 0.1245 Number Conc (M) 0.0163 0.0326 0.0652 0.130 0.2732 8.55 0.4989 1.034 What is the intercept of the linear regression line? 0.261 2.184 Number - .00497 What is the concentration of a solution with an absorbance of 0.473? Number | .056 m .056 What is the concentration of a solution with an absorbance of 1.079? Number .127Explanation / Answer
a plot of Absorbance (A) vs concentration (C) has to be straight line. from this slope and intercpet can be calculated.
The data on Absorbance (A) and concentration (C) is plotted and shown below.
the equation is in the form of y= mx+C, where m =slope =8.395 and c=intercept =-0.025
the equation of best fit is A=8.395* concentration-0.025 (1)
when A=0.473, from Eq.1, 0.473= 8.395* concentration -0.025
concentration = (0.473+0.025)/8.395=0.059M
when A= 1.079, from Eq.1, 1.079= 8.395* concentration -0.025
concentration = (1.079+0.025)/8.395=0.1315M