EBK ORGANIC CHEMISTRY-PRINT COMPANION (
4th Edition
ISBN: 9781119776741
Author: Klein
Publisher: WILEY CONS
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The amount of tartaric acid is responsible for the tartness of wine and controls the acidity of the wine. Tartaric acid also plays a very significant role in the overall taste, feel and color of a wine. Tartaric acid is a diprotic organic acid The chemical formula for tartaric acid is C4H6O6 and its structural formula is HO2CCH(OH)CH(OH)CO2H.
A 50.00 mL sample of a white dinner wine required 21.48 mL of 0.03776 M NaOH to achieve a faint pink color. Express the acidity of the wine in terms of grams of tartaric acid, H2C4H4O6 (M. M. = 150.10) per 100 mL of wine. Assume that the two acidic hydrogens are titrated at the end point.
MM H2C4H4O6 = 150.10
MM NaOH = 40.00
Below is the balanced chemical equation for this titration.
Part A
The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known
as luminol, is used by forensic scientists in analyzing crime scenes for
the presence of washed-away blood. Luminol is so sensitive that it can
detect blood that has been diluted 10,000 times. A basic solution of
luminol is often sprayed onto surfaces that are suspected of containing
minute amounts of blood.
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 g of luminol into a total volume of 75.0 mL of H2O.
What is the molarity of the stock solution of luminol?
Express your answer with the appropriate units.
Luminol has a molecular weight of 177 g/mol.
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Part B
Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00x10-2 M. The diluted solution is then placed in a spray bottle
for application on the desired surfaces.
How many moles of…
Dangerous Paint Stripper Jessica has a summer job working for the
city parks program. She has been using a cleaner called “Graffiti Gone” to
remove graffiti from the bathrooms. She has to take a lot of breaks, because
the chemical makes her throat burn. It also makes her feel dizzy sometimes,
especially when the bathrooms don’t have very many windows. On the label, she
sees that the cleaner has methylene chloride in it. She feels like she’s
managing to get the work done, but she is worried about feeling dizzy. She
wants to find out more about this chemical, what harm it can cause, and
whether there are safer ways to do this work.
Questions for following story.
1. What went right in this situation?
2. What went wrong in this situation?
3. What steps should be taken in this workplace to make sure employees are
better protected and prepared the next time?
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