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Analytical Chemistry
Page 10
Questions (747)
An 27 liter indoor air sample is collected in a Tedlar bag in the crawl space of a building built on an old municipal dump.
1 answer
asked by
steve
818 views
A test solution is prepared by pipetting 2.0 mL of an original sample into a 250 mL volumetric flask and then diluting to the
mar
5 answers
asked by
Bob
848 views
Sulfite (SO3^2-) in wine was measured by the following procedure: 50.0ml of wine were added 5.00ml of solution containing
3 answers
asked by
Ken
837 views
In the test for chloride ion why is it necessary to acidify with hno3
2 answers
asked by
Agu
808 views
A solution of I2 was standardized with ascorbic acid. Using a .1000 g sample of pure ascorbic acid, 25.32 mL of I2 were required
2 answers
asked by
Candy
854 views
One buffer solution used to calibrate a pH electrode was made by dissolving 2.24g of potassium propanoate, C2H5COOK, in 250cm3
2 answers
asked by
Jen
826 views
How would your calculated %P2O5 value be affected if you had not used this blank solution
2 answers
asked by
sami
840 views
A student determined the chloride content of a commercial salt by using the Mohr method. A 0.5324 -g sample of the salt was
2 answers
asked by
tara
848 views
Include an explanation, balanced chemical equation, units, significant figures and/or calculations where appropriate.
Standardiza
6 answers
asked by
Jake
824 views
When a 0.5725 g sample of Lysol was titrated with 0.100 M NaOH, and endpoint was obtained at 15.00 mL. What is the percent of
3 answers
asked by
Alisha
810 views
Consider the titration of 40.0 mL 0.250 M ethylamine, C2H5NH2, with 0.350 M HCl.
Determine each of the following and sketch the
5 answers
asked by
danna
1,280 views
An analytical chemist weighs out 0.291 g of an unknown diprotic acid into a 250 mL volumetric flask and dilutes to the mark with
1 answer
asked by
Nadia
46 views
Could you check my answers and if wrong, suggest the right one.
1. In gas chromatography, two measurements are made. Identify the
2 answers
asked by
Mikal
806 views
A 100ml aliquot of a water sample containing Ca(II) and Mg(II) is titrated with 22,74mL of EDTA 0.00998 mol/L at PH 10. Another
2 answers
asked by
william
813 views
how can spectra be used in chemical analysis?
3 answers
asked by
jessica
800 views
A water sample is suspected to be contaminated by iron (III) ions. How could you determine if the sample is really contaminated?
2 answers
asked by
Christ
804 views
Potentiometric Acid-Base Titration:
The tasks to be performed in Experiment #6 include: A. Preparation of a 0.05 M solution of
2 answers
asked by
Malik
811 views
The following results were obtained when a sample of pineapple juice was analyzed to determine its vitamin C content. A 19.8 mL
2 answers
asked by
Anonymous
800 views
Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−6 atomic percent. Assuming that the
5 answers
asked by
lisa
792 views
why should samples be weighed rather than measured volumetrically when determining the percent acetic acid in vineger
2 answers
asked by
Anonymous
786 views
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography adsorbent
1 answer
asked by
Ryan
764 views
Why is caffeine susceptible to analysis by reversed-phase HPLC and why couldn't it be performed by GC?
1 answer
asked by
Lyndsay
760 views
A 1.2431 -g alloy sample was analyzed for its copper content iodometrically. The alloy was dissolved in hot, concentrated nitric
6 answers
asked by
tara
783 views
Consider the following errors that could be made when running the TLC. Indicate what should be done to correct the error.
a) A 2
2 answers
asked by
~christina~
616 views
An aspirin tablet weighing 0.475 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved
the
2 answers
asked by
760 views
Calibration of a glass electrode gave a reading of 139.3 mV with 0.05 m potassium dihydrogen citrate buffer standard (pH =
1 answer
asked by
Cassie
756 views
In an experiment with a titration of Vitamin C with Iodine, why must the iodine dropper be standardized?
2 answers
asked by
Ashley
748 views
In a volumetric analysis experiment, a solution of sodium oxalate in acidic soltuion is titrated with a solution of potassium
1 answer
asked by
Kaley
738 views
The phosphorus in a completely dried fertilizer sample weighing 0.4498 grams was precipitated as MgNH4PO4*6H2O. The precipitate
3 answers
asked by
smiley
755 views
Consider the titration of 20.00 ML of KOH 0.01 mol/L with HNO3 0.01 mol/L. Calculate the PH of the titration solution after the
3 answers
asked by
wallace
739 views
a 1.32g sample on unknown containing KHP as a component was titrated with 22.48mL of 0.105 M NaOH to a pheolphthalein end point.
2 answers
asked by
Anonymous
721 views
If performing a potentiometric halide titration with Ag+:
1. Is siver nitrate a primary standard? Explain. 2. What is the purpose
2 answers
asked by
Ken
723 views
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The
1 answer
asked by
dakota
724 views
How many moles of the analyte P is gravimetrically equivalent to P2O5?
3 answers
asked by
m
707 views
Suppose you have a solution containing both an iron ii salt and an iron iii salt. how would you proceed to identify both Fe 2+
2 answers
asked by
Ash
717 views
Which type of chromatography would be used to separate and determine the RMM of two unknown bacterial proteins?
1 answer
asked by
Honey
681 views
We can determine the content (%) of calcium in milk through complexometric analysis by titration with EDTA. If we weigh 0.50 g
3 answers
asked by
william
716 views
how do i calculate the NaOH molarity from a titration of KHP and NaOH after preparing KHP to standardise NaOH. KHP mass was
2 answers
asked by
k
718 views
why we add acid to the standardization of sodium thiosulphate solution?
2 answers
asked by
aiman
689 views
why are the equivalence point and the end point different in a titration?
3 answers
asked by
shelley
696 views
Analysis of Tap water (Hardness)
50.00 mL of tap water was transferred to a 250 mL erlenmyer flask. 10mL of NH3/NH4^+ ph 10
3 answers
asked by
Lauren--PLEASE HELP
711 views
A titration involves titrating 0.4 M NaOH into a solution of 0.2 M H3PO4.
a.) Calculate the volume of NaOH that will be required
3 answers
asked by
Anonymous
704 views
Instead of using ratios for back titrations we can also use molarities if our solutions are standardized. A 0.188g sample of
4 answers
asked by
Caroline
681 views
Chromatography
How can I tell which of two mobile phases is more polar? Does the fact that one solvent (e.g. isopropanol/ammonia)
2 answers
asked by
Jeannie
683 views
If a 11.5 cm3 sample of lake water is found to have 178.5 ng As, what is the concentration of arsenic in the sample in parts per
1 answer
asked by
Emergent help please!!
668 views
Operating wavelength : 449 nm
Absorbance of solution 1 - Standard Dichromate-H2O : 0.560 a.u. Absorbance of solution 2 - Standard
1 answer
asked by
HELP
680 views
To determine the mass percentage of an iron sample, the dissolved sample [iron exists at the start as iron(II)] was titrated
1 answer
asked by
Anna
682 views
Predict the values of m/z and the most abudent fragments you would observe in the mass spectrum of di-n-propyl ether?
2 answers
asked by
Anonymous
654 views
The concentration of barium ions in any solution can also be determined via gravimetric analysis. An impure sample of barium
2 answers
asked by
sarah
681 views
Suggest other suitable indicators for determination of calcium trioxocarbonate (iv) content in chalk by back titration
2 answers
asked by
Wealth
666 views
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