10 min listen
The APsolute RecAP: Chemistry Edition - Episode 53: Beer-Lambert Law
The APsolute RecAP: Chemistry Edition - Episode 53: Beer-Lambert Law
ratings:
Length:
9 minutes
Released:
Nov 1, 2021
Format:
Podcast episode
Description
Coffee needs to be “just right” and we can tell how strong it is by the color (0:30). We can use the color to determine concentration also in Chemistry (1:09). The color we see is determined by the wavelength an object reflects, while absorbing all other colors (1:23).The Beer-Lambert Law absorbance to molar absorptivity, path length and concentration (2:08). In AP Chemistry, the molar absorptivity and path length are held constant, therefore absorbance is directly proportional to concentration (2:28).Experimentally, we measure absorbance using spectrophotometers (4:41). To determine the concentration of, for example, blue dye in a sports drink, we have to create a calibration curve using solutions with known concentration and measuring the absorbance (5:35). We can then use the graph and a measurement of absorbance of the sports drink to determine the concentration (6:16).In which of the following examples could you use spectroscopy and the Beer-Lambert law to determine the concentration?A. Determination of bilirubin in blood plasma samples. B. Determination of colorless zinc(II) nitrate in a sample. C. Determination of ethanol (drinking alcohol) in an alcoholic beverage. D. Determination of isopropyl in hand sanitizer.Thank you for listening to The APsolute RecAP: Chemistry Edition!(AP is a registered trademark of the College Board and is not affiliated with The APsolute RecAP. Copyright 2021 - The APsolute RecAP, LLC. All rights reserved.)Website:www.theapsoluterecap.comEMAIL:TheAPsoluteRecAP@gmail.comFollow Us:INSTAGRAMTWITTERFACEBOOKYOUTUBE
Released:
Nov 1, 2021
Format:
Podcast episode
Titles in the series (63)
The APsolute RecAP: Chemistry Edition - Types of Chemical Reactions: Chemistry might seem like magic occasionally, but you don’t need a crystal ball to predict products of reactions! by The APsolute RecAP: Chemistry Edition