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Analytical Chemistry
Page 7
Questions (747)
Hi,
Please advise on the following: - A procedure for the determination of Impurities A & B in a compound says to use a 4.6 x
1 answer
asked by
anne
372 views
I have a method using HPLC (high performance liquid chromatography).
It states that a 4.6 x 150mm,3um column should be used.
1 answer
asked by
angie
419 views
I have a question asking what the importance of a standard along other samples is. I''m really unsure as to why a standard is
1 answer
asked by
Fizza ASAP
313 views
Hi,
I have a question on Gas Chromatography(GC). The following were injected into the GC system: - 1) 1% sample solution in
1 answer
asked by
jess
427 views
Hi,
I have a queestion on Gas Chromatography(GC). The following were injected into the GC systemk: - 1) 1% sample solution in
1 answer
asked by
jess
422 views
how do I calculate error analysis on my tritation expirement?
1 answer
asked by
John
365 views
How do I find the mass of KHP?
0.5050 grams of KHP was used and placed into a 250mL volumetric flask and diluted to the mark with
2 answers
asked by
Linda
503 views
determine Fe3+ in a solution that may be in the 0.0001 to 0.0005 M range.outline a spectrophotometric method that would
1 answer
asked by
Equilibrium
425 views
name and give the formula for two cations that you think could be anailzed quantitatively by visible spectroscopy
1 answer
asked by
Anonymous
319 views
Determine the concentration of the HCl in a swimming pool?given 100ml of a standard solution of Na2CO3 of concentration
1 answer
asked by
kimberly
368 views
What is the problem of spotting TOO much sample on a TLC plate initially? Also, why is it bad to have too much solvent in the
2 answers
asked by
Jim
817 views
I am working on a HPLC lab where we are to determine the concentration of caffeine in two energy drinks. I am trying to figure
3 answers
asked by
Wheaties
473 views
Hi.
We performed an experiment on UV-Vis Spectrometry, by testing the absorbance of KMnO4 and KCr2O7 solutions at different
1 answer
asked by
Amie
450 views
what are the disadvantages of non aqueous titrations
3 answers
asked by
venkataramanaiah
2,998 views
A 100.0mL sample of the lake water was treated with 1.0mL of 1M AgNO3. 71.7mg of silver (I) chloride was isolated.What is the
1 answer
asked by
Toni Jones
456 views
Commercial breathalyzers contain .75 mg of K2Cr2O7, 1.5 mL of H20 and 1.5 mL of H2SO4. What is the concentraion of the
2 answers
asked by
Anonymous
1,012 views
Do you have to know accurately the concentration of NaOH?
1 answer
asked by
Mahlatse
452 views
In titrations involving sodium thiosulphate and potassium iodide, is it necessary to use starch solution to help us see the end
1 answer
asked by
janice
466 views
in gas chromatography, why do E1 and E2 give different peaks (areas) though it's the same compound??
For example, for 1-butene,
4 answers
asked by
Yoo
1,436 views
3. Imagine that more than one band appeared in the GC chromatogram, but you were unable to run the standards. Instead you took
1 answer
asked by
Mandy
770 views
A sample of hexane and octane is injected into a gas chromatograph equipped with a nonpolar column. Predict which one will have
4 answers
asked by
Jeanne
1,130 views
Many analytical instruments require liquid nitrogen. While filling an instrument with liquid nitrogen, an analytical chemist
3 answers
asked by
mia
541 views
The rate/distance which a compound moves up a TLC plate is based on differential distribution between what two phases?
3 answers
asked anonymously
64 views
How do we correct the problem if during TLC development the solvent ran off the plate?
1 answer
asked by
Jeanne
359 views
A student needs to determine by titration with NaOH the precise %KHP in an unknown sample that is thought to contain
5 answers
asked by
Rosie
1,557 views
an iron ore sample was dissolved in Hydrochloric acid the iron was obtained as Fe2+. The solution was titrated with 41.08 mL of
2 answers
asked by
Laura
716 views
which indicator is more reliable in the titration of H3PO4 with NaOH using methyl orange and phenolphthalein as indicators
3 answers
asked by
gina
1,142 views
The following is part of a procedure for a limit test for sulphates in an NaOH sample:-
Dissolve 3.0g of NaOH in 6ml of deionized
1 answer
asked by
candy
471 views
A technician needs to determine the concentration of lead ions in a sample of water
a) Suggest a test chemical that can be added
1 answer
asked by
Kelsey
503 views
Please help to determine the (%w/w) benzoyl peroxide (C14H20O4) in a sample.
Procedure: 2.500g of sample was dissolved in 75ml
2 answers
asked by
angela
1,176 views
What is a double indicator titration?
1 answer
asked by
Gill
348 views
advantages and diaadvantages of potentiometris titration
1 answer
asked by
Johnson
313 views
This question is confusing me the way its presented and also is relating it to the combustion method that is used to analyze
4 answers
asked by
Shinu
403 views
a student did an alkalinity determination correctly,except that the sample titrated had a volume of 90.0 mL. Volume A was found
2 answers
asked by
alissa
1,025 views
The absorbance of a 6.3x10^-5M solution of an iron complex was measured to be 0.328 at the optimum wavelength. A second solution
2 answers
asked by
L**
481 views
1. Find examples of reagents used in performing chemical resolutions of acidic, basic, and neutral racemic compounds.
2. Propose
2 answers
asked by
CMM
533 views
how do i calculate a concentration ratio of oxidised to reduced cytochrome c Fe2+ to Fe3+
given at 25 C and pH7 E(mV) as 100 and
1 answer
asked by
lu
926 views
An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved
the
2 answers
asked by
Alexander
609 views
What would be the effect of decrease the carrier gas flow rate, raise the column temp, have on the retention time?
What would be
2 answers
asked by
Sarah
1,196 views
What are the units of retention time in gas liquid chromatography? Minutes or seconds?
2 answers
asked by
Anonymous
476 views
How would you adjust the instrument for GC analysis to get better resolution? Please discuss.
What is another GC detector and
3 answers
asked by
Chelsea
327 views
what is the rf value for peru balsam in order of identification?
1 answer
asked by
ira
322 views
would a structure containing a cation have a smaller Rf value?
5 answers
asked anonymously
13 views
explain how paper chromatography separates the components in a solution
2 answers
asked by
kate
859 views
solvent layer: 1
solid precipitate: no I ran the solvent layer I got in my unknown in the GC and I had sharp peaks in the
7 answers
asked by
~christina~
1,249 views
How can looking at traces of GC (looking at their peaks and data such as area and retention time) enable me to determine what
1 answer
asked by
helpmeplease
334 views
How can looking at traces of GC (looking at their peaks and data such as area and retention time) enable me to determine what
1 answer
asked by
helpmeplease
421 views
How would I compare using peak heights vs peak areas for GC quantitation?
Thanks
3 answers
asked by
~christina~
321 views
What are the factors that cause the difference between measured pH and calculated pH in titration.
1 answer
asked by
Eunice
436 views
WHY IS RF VALUE ONLY UP TO 1 AND NOT ANY BIGGER?
1 answer
asked by
Anonymous
349 views
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