Question
In: Chemistry
In order to know about solubility for caffeine and benzoic acid, I put caffeine and benzoic...
In order to know about solubility for caffeine and benzoic acid, I put caffeine and benzoic acid in water and HCl and NaOH, and Caffeine was miscible in NaOH and Benzoic acid was miscible in HCl.
1. could you explain me why?
2. How would you know if caffeine and benzoic acid are acid or base?
Solutions
Expert Solution
1
Benzoic acid dissolve in NaOH ,Caffene in HCl
benzene weakly ionise in water so it shows poor solubility in water.it has non polar part benzene
C6H5COOH + H2O <---> C6H5COO- + H3O+
in acidic medium equilibrium shift to left so insoluble in acid
in basic medium equilibrium shift to right
In alkaline medium, benzoic acid becomes soluble. The abundant OH- ions will react fully with benzoic acid in acid-base reaction to form water and benzoate ion, which now is soluble in water due to strong ion-dipole forces of attraction.
2
benzoic acid is acid because it react with base
caffene is base because it react with acid
queen_honey_blossom answered 2 years agoRelated Solutions
Calculate the apparent solubility of benzoic acid at pH 5. Benzoic acid is a weak acid,...
Calculate the apparent solubility of benzoic acid at pH 5.
Benzoic acid is a weak acid, with pKa = 4.2 and
solubility of nonionized species S0 = 0.028
mol/L.
Please show steps
Spectrophotometric Analysis of a Mixture: Caffeine and Benzoic Acid in a Soft Drink Benzoic Acid 230nm...
Spectrophotometric Analysis of a Mixture: Caffeine and
Benzoic Acid in a Soft Drink
Benzoic Acid
230nm
270nm
2mg/mL
0.231
0.034
4mg/mL
0.390
0.051
6mg/mL
0.539
0.058
8mg/mL
0.685
0.070
10mg/mL
0.888
0.094
Caffeine
230nm
270nm
4mg/mL
0.935
1.525
8mg/mL
0.285
0.442
12mg/mL
0.428
0.703
16mg/mL
0.624
1.066
20mg/mL
0.724
1.226
Soft Drink
230nm
270nm
2mL
0.738
0.273
4mL
1.313
0.522
Mountain Dew Caffeine:54mg/12fl oz
Measure the ultraviolet absorption spectrum of the 2:100 and
4:100 dilutions of the soft drink. Find...
You need to separate a mixture of caffeine and benzoic acid. The sample has an initial...
You need to separate a mixture of caffeine and benzoic acid. The
sample has an initial weight of 2.00 g and a content of 25.0%
caffeine. You use dichloromethane, 10.0% NaOH solution, and 10.0%
HCl. You are able to isolate 0.60 g caffeine and 1.00 g benzoic
acid. Complete the following calculations and show your work.
i)Calculate the amounts of caffeine and benzoic acid in the
initial sample.
ii) How much 10% NaOH solution would be needed to neutralize all...
Determination of Benzoic Acid and Caffeine in Soft Drinks via Liquid Chromatography. Q1: This experiment is...
Determination of Benzoic Acid and Caffeine in Soft Drinks via
Liquid Chromatography.
Q1: This experiment is reverse phase chromatography.
What does that tell you about the polarity of the mobile and
stationary phases? (2 pts)
Q2: Which compound do you expect to elude first from the
column and why? (2 pts)
Q3: What is the definition of an isocratic separation?
(2 pts)
Q4: What is an acceptable value for the resolution of a
column? (2 pts)
Q5: Do you expect...
How do i determine the distribution coefficent of benzoic acid? I used 0.050 grams of benzoic...
How do i determine the distribution coefficent of benzoic acid?
I used 0.050 grams of benzoic acid and performed extractions 3
times using 2.0 ml of methylene cloride and 2.0 mL of water and got
around 0.035 grams after all the extractions done.
also is there a correlation between the values of the
distribution coefficent and the polarity of the compound?
thank you
1) The procedure stated “benzoate is protonated to make benzoic acid. Caffeine has no appreciable basicity, so...
1) The
procedure stated “benzoate is protonated to make benzoic acid.
Caffeine has no appreciable basicity, so it is neutral at pH 2” –
what does it mean to protonate? Why would it be important to
protonate benzoate? Why is caffeine not affected the same way? Cite
and interact
2) UV,
fluorescence and luminescence: Does Beers law hold true for all
three? What dictates what kind of chemical compound will
demonstrate as a UV chromophore or naturally fluoresce or naturally
luminesce? Cite...
Calculate the maximun percet recovery of caffeine with the given information. Caffeine solubility in water is:...
Calculate the maximun percet recovery of caffeine with the
given information.
Caffeine solubility in water is: 2.2 mg/mL at 25°C; 180mg.mL
at 80°C; 670 mg/mL at 100C.
two vivarine tables each containing 20mcg, a total of 400mcg
or 0.4g of caffeine. This technique of extractions utilizes a
separatory funnel----->the total recovery was 0.16g
The procedure was:
Obtain 2 Vivarin tablets and crush them using pestle (the
total caffeine in the two tablets where 0.4g)
Combine pills, 60mL distilled water, and...
. Given 100mg/L benzoic acid and 200 mg/L caffeine stock solutions, explain how you will make...
. Given 100mg/L benzoic acid and 200 mg/L caffeine stock
solutions, explain how you will make 2, 4, 6, 8, and 10mg/L benzoic
acid solutions and 4, 8, 12, 16, and 20 mg/L caffeine solutions.
Assume that you will have 50 and 100 mL volumetric flasks and your
usual variety of pipet sizes and list the exact volume glassware
you would use for each of these dilutions. Be sure to finish this
problem and list exact glassware, the answer here...
. Given 100mg/L benzoic acid and 200 mg/L caffeine stock solutions, explain how you will make...
. Given 100mg/L benzoic acid and 200 mg/L caffeine stock
solutions, explain how you will make 2, 4, 6, 8, and 10mg/L benzoic
acid solutions and 4, 8, 12, 16, and 20 mg/L caffeine solutions.
Assume that you will have 50 and 100 mL volumetric flasks and your
usual variety of pipet sizes and list the exact volume glassware
you would use for each of these dilutions. Be sure to finish this
problem and list exact glassware, the answer here...
Pure Lauric Acid Lauric Acid + 0.4 g Benzoic Acid Lauric Acid + 0.5 g Benzoic...
Pure Lauric
Acid
Lauric Acid +
0.4 g Benzoic Acid
Lauric Acid +
0.5 g Benzoic Acid
Mass of
Lauric Acid (g)
3.07
3.05
3.06
Mass of
Benzoic Acid (g)
0
0.43
0.51
Freezing
Point
43
38
37
Freezing
Point Depression, DTf
-5
-6
molality
of Benzoic Acid in Lauric Acid
?
?
Moles of
Benzoic Acid
?
?
Experimental Molar Mass of Benzoic Acid
?
?
Average
Molar Mass
?
?
Percent
Error
?
?
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