:(((( Flashcards
Esterification Reaction
An acid anhydride (or carboxylic acid) react with alcohols to form esters
Anhydride is
water removed from an acid
FeCl3 reacts with what to turn purple
phenol group
What makes salicylic acid unable to be consumed directly
-OH group (alcohol). Phenolic hydroxyl group
Acetic acid is a part of what food
vinegar
Ace-tyl-sali-cylic acid
Ace-tyl-sali-cylic acid
Spell the thing that is produced when salicylic acid and acetic anhydride combine
Ace-tyl-sali-cylic acid
Salicylic acid is a benzene ring with a
alcohol group and a carboxyl acid
Do NOT call -OH what
DO NOT call it hydroxide
Acetic anhydride is an ___ anhydride
acid anhydride
An alcohol group attached to a benzene ring is called
a phenol
Alcohol is a __ acid
Weak
A phenol is a ____ acid
Strong
All the negative side effects are linked to what
The hydroxyl group
The hydrogen from the alcohol group on salicylic acid attaches to what
The carbon on acetic anhydride
What are the products of this esterification reaction
Acetic acid and acetylsalicylic acid
The esterification reaction is jump started by what
An acid (H2So4)
Phenol group gets converted into
An ester
Why is it called acetylsalicylic acid and not just an ester
Because it still has a carboxylic acid
What is a lachrymator
A eye and nasal irritant
Concentrated sulfuric acid jump starts the reaction because
its a strong acid and a strong oxidizer
Concentrated sulfuric acid is a strong oxidizer and what
A strong acid
The reason the aspirin creation has to happen in ice water is because
Cold lower solubility, allowing crystals to form
What was the goal of the 3rd lab
To find the % of salicylic acid in commercial medication
ASA+NaOH creates
A form of ASA that does not have hydrogen
After creating the salicylic acid you add water to dilute it to
1 liter
To the stock solution you need to add H+ ions to reform the
salicylic acid
You add FeCl3-KCl-HCl in excess to the stock solution to add H+ ion that make
Salicylic acid
FeCl3 is added to stock so that
It can react with the phenol of the salicylic acid
KCL is added to
Maintain same ionic strength
HCl is added to
Add the H+ ion to make salicylic acid
What is added to the stock solution
FeCl3-KCl-Hcl
Analytical wavelength
Is where absorptance is the highest
What is Beer’s Law
A=Ebc
In Beer’s law (a=ebc) what is a
Absorptancy
In Beer’s Law (a=ebc) what is e
Epsilon
In Beer’s Law (A=ebc) what is b
The pathlength of light through the solution (the width of the cuvette)
In Beer’s law (a=ebc) what is c
The concentraion
What is b typically
1cm
So, is b is always one that epsilon times b is just equal to epsilon. This is the ___
slope
The slope of concentration is what
Epsilon
Slope is found by
Rise/run
Beer’s law (a=ebc) has NO
Y-intercept
If beer’s law (a=ebc) has no y intercept then the equation starts
At the origin
Hydrolysis reaction is
A reaction of a substance with water
Why is Hcl added to the stock
To form salicylic acid
What is a hydrolysis reaction
A reaction of a substance with water
What is a reference (blank) solution
A solution containing all the components of the solution except the species being determined
What is an esterification reaction
Reaction of an alcohol with a carboxylic acid (or an acid anhydride) to form an ester
What is analytical wavelength
The place where absorptance is the highest
What is carboxylic acid
OH=C-O
What is an ester
O=C-O-CH3
What is acetic anhydride
Ch3-C(=O)-O-C(=O)-Ch3
