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Analytical Chemistry
Page 3
Questions (747)
Performing a gravimetric analysis of Ca2+.
25 mL of unknown [Ca2+} added to 25 mL of 0.15 (NH4)2C2O4 and 75 mL of HCl. Urea also
7 answers
asked by
Anonymous
879 views
Consider the titration of 100.0 mL of 0.100 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make
4 answers
asked by
Sandy
4,137 views
Impure sample of table salt that weighed 0.8421g, when dissolved in water and treated with excess AgNO3, formed 2.044g of AgCl.
3 answers
asked by
London
1,879 views
How can I determine the concentration of HCl remaining in the flask after back titration?
Thank you!! I have been given weight of
4 answers
asked by
Help!!
723 views
ALuminum can be determined gravimetricaly by the reaction with solution of 8-hydroxyquinoline (C9H7NO3).The net ionic equation .
4 answers
asked by
NELLY
1,619 views
Potassium ferricyanide has an extinction coefficient of 1020 1/M*cm at 420 nm. The absorbance of a sample of unknown
3 answers
asked by
Jay
891 views
Selenium from 0.108 g of Brazil nuts was converted into a fluorescent product, which was extracted into 10.0 mL of cyclohexane.
3 answers
asked by
Anon
1,335 views
1.4 Orthophosphate (PO4) is determined by weighing as ammonium phosphomolybdate. (NHA)PO4.12M003. Calculate the percent P in the
3 answers
asked by
Mukona
300 views
how to find the percent of chloride in A 3.000 g sample of a soluble chloride is titrated with 52.60 mL of 0.200M AgNO3.
What is
3 answers
asked by
Margaret Rodriguez
377 views
percentage error of the determination resulting from the presence of the Na2SO4
4 answers
asked by
n/a
244 views
a water sample is suspected to be contaminated by Hg(II) ions. How could you determine if the sample is really contaminated?
4 answers
asked by
Aiko
936 views
A sample weighing 1.25 mg containing a certain compound M (FW 292.16 g/mol) was dissolved in
solvent in a 5.00 mL volumetric
3 answers
asked by
Ibrahim
928 views
A 500.0 mL sample of saturated nickel(II) phosphate solution was analyzed spectrophotometrically and found
to contain 1.88 ×
5 answers
asked by
Henry
2,205 views
A sample of 0.250 g of nickel complex was titrated with 0.150 M EDTA. If the titration of the nickel sample required 7.5 mL of
3 answers
asked by
Anonymous
943 views
In order to identify a compound using TLC it is necessary to spot a sample of the pure compound. Why is this necessary?
3 answers
asked by
Mor
552 views
Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I
4 answers
asked by
Gloria
1,763 views
A 31.43 mL volume of 0.108 M NaOH is required to reach the phnolphthalein endpoint in the titration of a 4.441 g sample of
4 answers
asked by
Jeffrey
746 views
What will happen to the Rf values of the pigments if you were to increase the relative concentration of acetone in the
3 answers
asked by
Toby
892 views
(b) The following set of lead determinations on separate aliquots of a pooled blood serum were reported: 103, 106, 107, and 114
4 answers
asked by
Innocent Chipman
917 views
Calcium is determined gravimetrically by precipitating it as CaC2O4â‹… H2O, followed by isolating the precipitate as CaCO3.
4 answers
asked by
anonymous
1,675 views
An analytical chemist weighs out 0.225g of an unknown diprotic acid into a 250mL volumetric flask and dilutes to the mark with
3 answers
asked by
Audrey
2,936 views
A 0.391 g sample of KHP will be titrated with a NaOH solution with an assumed concentration of 0.100 M. Calculate the volume of
3 answers
asked by
Jackie
1,052 views
I did a back titration with an unknown carbonate and using the average % carbonate (by mass) which I found to be 27.40% and
4 answers
asked by
Laura
1,333 views
A 10.231-g sample of window cleaner containing ammonia was diluted with 39.466 mL of 0.1063 M HCl to reach the bromocresol green
3 answers
asked by
Tanya
1,890 views
Lab on Determination of copper in brass. I have mass of brass at .1011g. My concentration of diluted solution's unknown is
3 answers
asked by
Tam
713 views
Question: a sample is to be analyzed for its chloride content by the precipitation and weighing of silver chloride. what mass of
2 answers
asked by
Anonymous
907 views
quantitative determination of acetylsalicylic acid in aspirin tablets by back titration
1)why do we use a more dilute NaOH
3 answers
asked by
krissy
1,568 views
The amount of copper in a wire was determined by a redox titration using KMnO4 as the titrant. A 0.4185-g sample was dissolved
3 answers
asked by
help me
298 views
A student was tasked to perform gravimetric analysis of a soluble sulfate. His unknown sample weighed 0.7543 g. The sample
4 answers
asked by
Len1331
1,340 views
One method of analyzing amino acids is the van Slyke method. The characteristic amino groups (−NH2) in
protein material are
3 answers
asked by
Thio
1,177 views
A student needs to analyze a mixture containing an alcohol and a ketone by silica gel tlc. Consult the table of solvent
2 answers
asked by
Mia
1,087 views
I have completed a back titration with an antacid tablet weighing 1.25 mg and 0.1494 M concentration of HCL (100 mL was added)
3 answers
asked by
ashley
575 views
how to calculate ph if given contain 0.63g og hno3 pet 100 ml solution
3 answers
asked by
Fofo
443 views
Can a flame test and emission spectrum test be used to identify a mixture with two or three elements?
4 answers
asked by
Anonymous
632 views
Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass.
2 answers
asked by
Tiffany
929 views
The following data were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL).
3 answers
asked by
James
1,436 views
A 12.6 mL sample of vinegar, containing acetic acid, was titrated using 0.542 M NaOH solution. The titration required 24.1 mL of
4 answers
asked by
walter
639 views
The Fe2 (55.845 g/mol) content of a 2.271 g steel sample dissolved in 50.00 mL was determined by tiration with a standardized
4 answers
asked by
Cassie
1,885 views
Please help, I can't do this and its stressing me out ?!?! A 25.0 mL aliquot of an aqeuous quinine solution was diluted to
2 answers
asked by
Daniel
803 views
10.0 mL of a Cu2+ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added.
4 answers
asked by
Samantha
2,013 views
In a volumetric analysis experiment, a solution of sodium oxalate (Na2C2O4) n acidic solution is titrated with a solution of
3 answers
asked by
Monteshia
2,260 views
An analytical procedure requires a solution of chloride ions ,How many grams of CaCl2 must be disolved to make2.15L of 0.0520 M
5 answers
asked by
mathew
1,925 views
A 1.857 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl
3 answers
asked by
Sparkle
2,183 views
why do different compounds give different retention factors (Rf values) in thin layer chromatography (TLC)
2 answers
asked by
jessica
750 views
Suppose you titrated a sample of distilled water with EDTA, approximately what volume of EDTA would be required?
2 answers
asked by
Julie
875 views
If after precipitation of the Group I cations as chlorides by the reaction with HCl, nearly all of the precipitate dissolves in
3 answers
asked by
J
461 views
50.00 mL of OOH was diluted to 250.0 mL with deionized water. In the determination of the total cation concentration, 25.00 mL
3 answers
asked by
Georgia
446 views
could the quantitative precipitation be useful to determine the mass percent of copper in a sample that also contains magnesium
3 answers
asked by
ana
454 views
Hi there - I'm going to post the question as written in my book.
Three 20.0 mL samples of nitric acid are titrated with a 0.200
4 answers
asked by
Dexter
934 views
What advantages does H NMR have over melting point in the determination of purity?
4 answers
asked by
anon
1,312 views
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