   Chapter 1, Problem 65RIL

Chapter
Section
Textbook Problem

You can analyze for a copper compound in water using an instrument called a spectrophotometer. [A spectrophotometer is a scientific instrument that measures the amount of light (of a given wavelength) that is absorbed by the solution] The amount of light absorbed at a given wavelength of light (A) depends directly on the mass of compound per liter of solution. To calibrate the spectrophotometer, you collect the following data: Plot the absorbance (A) against the mass of copper compound per liter (g/L), and find the slope (m) and intercept (b) (assuming that A is y and the amount in solution is x in the equation for a straight line, y = mx + b). What is the mass of copper compound in the solution in g/L and mg/mL when the absorbance is 0.635?

Interpretation Introduction

Interpretation: The absorbance should be plotted against the mass of the copper. The slope, intercept and mass of copper compound in solution should be determined.

Concept Introduction:

Graph and graphing: In the equation,y=x+b where y is referred as dependent variable, x is called the independent variable, and m is the slope of the line.

Explanation

The graph is as follows,

Slope=ΔyΔx=0.2571.029×10-3=249

When x=0y is also zero, therefore the y intercept is zero.

y=mx+c=249x+0

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