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Lab #8 Quiz

# Lab #8 Quiz - NAMEEE m M’QZ H€nQéIAIEM 1107(Lab#8-Form...

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Unformatted text preview: NAMEEE m M’QZ H€nQéIAIEM 1107 (Lab #8-Form A) SCORE Z f :5 ;. *Show ALL work to receive credit for the problem. Answers without calculﬂions shown will receive ZERO credit. Answers without proper units will have partial credit deducted. (l) (2 pts) Colorless aqueous aluminum solutions react with Eriochrome Cymine R to form complexes of what color? 7 9m (2) (2pts) A solution has an Absorbance of 0.90, a molar absorptivity cwﬁrent of 30 M cm ,and a path length of 1 cm. Calculate the concentration of the absorﬁng species providing appropriate units. A 90 9 ’, , 0 fl 3' E \7 C K ,M 8‘7 @)C\)3——— Eb an (3) \G(2 pts) According to the following graph, what 13 the concentration of asolutton that has an absorbance of 0. l7? :- o.35 ' 63\$ 0.3 0.25 .° N 0.15 Absorbance .0 .s l l ’77 ‘i' ——l l 0 0.1 0.2 0.3 concentration (mg/L) . ‘ _. ’ (4) (2 pts) Describe the purpose of a ﬂocculant. to 18mm W WWWCS‘ m NW (5) (2 pts) The higher the amount of aluminum in the sample, the more intense the color of the complex, and the stronger it will absorb light. Another way of saying this is that the intensity of the color is proportional to the concentration of analyte. What else an affect the intensity of the color of the solution (note: two things listed in reading)? the (m i the Contth‘rthmon 010 M mm mm m M 3&ka ...
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