number 29 cm cell when measulled compound? ACL o2 29. A solution suspected of co
ID: 1034247 • Letter: N
Question
number 29
cm cell when measulled compound? ACL o2 29. A solution suspected of containing copper is analyzed. To determine the standard curve, the absorbance of five standards ranging from 0.125 mg/ml Cu to 1.25 mg/ml 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? ho tometer will often produce values of both Absorbance and % Transmittance. ine the concentration of a compound inExplanation / Answer
The equation for best fit curve is,
y = 0.6136x + 0.0142, where y = absorbance and x = concentration (mg/mL).
Therefore, x = (y - 0.0142)/0.6136
Therefore, concentration of unknow solution (reading-1) x1 = (0.438-0.0142)/0.6136 = 0.691 mg/mL
x2 = 0.684 mg/mL
x3 = 0.615 mg/mL
Average concentration of the unknown = 0.663 mg/mL.
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