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Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter7: Statistical Data Treatment And Evaluation
Section: Chapter Questions
Problem 7.10QAP
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<Homework 5
+ Molarity
1 of 24
<.
I Review I Constants I Periodic Table
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
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of
H2O.
What is the molarity of the stock solution of luminol?
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.
Express your answer with the appropriate units.
• View Available Hint(s)
Luminol has a molecular weight of 177 g/mol.
HA
molarity of luminol solution
Value
Units
Submit
Part B
Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00x10-2 M . The diluted solution is then
placed in a spray bottle for application on the desired surfaces.
How many moles of luminol are present in 2.00 L of the diluted spray?
Express your answer with the appropriate units.
• View Available Hint(s)
HA
moles of luminol :
Value
Units
EGO
23
PAGES
FEB
étv
MacBook Pro
Transcribed Image Text:Safari File Edit View History Bookmarks Window Help 4)) 51% O Sun 10:43 AM session.masteringchemistry.com Consider summer class... Inbox (13) - thesym1@g... Class Schedule Listing Schedule 111.009 & 111... Ellucian Degree Works... Pearson's MyLab & Mas... ALEKS - Sofia Simmons... MasteringChemistry: H... <Homework 5 + Molarity 1 of 24 <. I Review I Constants I Periodic Table 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 The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? 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. Express your answer with the appropriate units. • View Available Hint(s) Luminol has a molecular weight of 177 g/mol. HA molarity of luminol solution Value Units Submit Part B Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00x10-2 M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the diluted spray? Express your answer with the appropriate units. • View Available Hint(s) HA moles of luminol : Value Units EGO 23 PAGES FEB étv MacBook Pro
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