on 8 of 41 Suppose you generate the follawing spectroscopic data with five solut

Question

on 8 of 41 Suppose you generate the follawing spectroscopic data with five solutions of known concentration. What is the slope of the linear regression line formed by these points? Conc (M Absorbence 0.0169 0.1227 0.2256 0.4656 0.9528 1852 Number 0.0338 0.0676 0.135 02258 What is the intercept of the linear regression line? 0270 1852 Number What is the concentration of a solution with an absorbance of 0.4497 What is the concentration of a solution with an absorbance of 1.1212 Number O Previous e Give Up & View Solution O Check AnswerNext | Exi ndows

Explanation / Answer

a) slope:

To do this, plot the data into an Absorbance Vs concentration plot. The data is the following (To get a similar expression of y = a + bx)

Slope = b = 6.8732 M-1

b) intercept:

a = 0.00439

c) now that we know that the linear regression equation is:

y = 0.00439 + 6.8732x

then concentration at this absorbance = 0.449:

0.449 - 0.00439 / 6.8732 = x

x = 0.0647 M

d) at Absorbance = 1.121

x = 1.121 - 0.00439 / 6.8732

x = 0.1625 M

Hope this helps

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