Indicate how each of the following would affect the value the absorbance (too lo
ID: 489537 • Letter: I
Question
Indicate how each of the following would affect the value the absorbance (too low. too high, no effect) of the indicated solution. Explain your answers. A student prepares solutions A at instructed and pours it into a wet beaker. A student rinses the 10.00 mL piper only with DI water in the preparation of D (but does the rest of the procedure as instructed). A student fills the volumetric flask containing solution B so that the bottom of the meniscus is below the mark on the flask (but does the rest of the procedure as instructed). A yellow dye, FD&C; yellow 3, is used in some candy coatings. A 2.4 times 10^-5 M solution of this dye has an absorbance of 0.418 at its lambda_sin. Calculate the molar absorptivity, epsilon, of the dye at this wavelength, assuming a sample cell with a 1.0 cm path length. The yellow dye from one piece of candy is completely extracted into 10.00 mL of water and diluted to 100.00 mL with water. the absorbance of the diluted solution is 0.556 at its lambda_max. Calculate the concentration of the dye in the diluted solution. Calculate the number of grams of this dye in the coating of one piece of candy (MM of dye = 271 g/mol).Explanation / Answer
A)
if wet, it has water if it has water, it will get diluted, so the ocncentratin decrease, so Absrbtion decrases as well
B)
Addition of ions will make interacitn of ions in solution, so the absorbance must increase
C)
if the bottom of the minuscus is low, the volume marked will be lower, so concentration is higher meaning absorbtion will be higher
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