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DochEvi [55]
3 years ago
10

32. A solution suspected of containing copper is analyzed. To determine the standard curve, the absorbance of five standards ran

ging from 0.125 mg/L Cu to 1.25 mg/L Cu was measured and graphed against the concentration. The slope of the linear best-fit line was determined to be 0.6136 and the y-intercept was 0.0142. If three samples of the unknown solution have absorbance values of 0.438, 0.434, and 0.439 what is the concentration of the unknown
Chemistry
1 answer:
Roman55 [17]3 years ago
3 0

Answer:

0.689 mg/L Cu

Explanation:

The equation of the best-fit line is:

<em>y</em> = 0.6136<em>x</em> + 0.0142

Where <em>y</em> is the absorbance and <em>x</em> is the concentration in mg/L.

Now using that equation we <u>calculate </u><u><em>x</em></u> when <em>y</em> is equal to 0.438, 0.434 & 0.439.

1) 0.438 = 0.6136<em>x</em> + 0.0142

x = 0.691 mg/L

2) 0.434 = 0.6136<em>x</em> + 0.0142

x = 0.684 mg/L

3) 0.439 = 0.6136<em>x</em> + 0.0142

x = 0.692 mg/L

Finally we <u>calculate the mean of the three concentrations</u>:

  • (0.691 + 0.684 + 0.692)/3 = 0.689 mg/L
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