All Questions
Tagged with elemental-analysis experimental-chemistry
14
questions
2
votes
3
answers
131
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How to identify salts using mutual reactions
There are ten test tubes in the rack at your disposal (1 – 10) and each test tube contains one of the aqueous solutions of the following salts: $\ce{Na2SO4, AgNO3, KI, Ba(OH)2, NH4Cl, Ag2SO4, Pb(NO3)2,...
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1
vote
0
answers
90
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What is the correct way to specify the weight fraction from bulk compositional data with a listed total % (e.g. from XRF, ICP)?
TL;DR = With bulk composition results, such as from X-Ray Fluorescence (XRF) testing, is the mass fraction of a given analyte that analyte given as a % or the analyte divided by the given total mass %?...
- 500
-1
votes
1
answer
143
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battery using zinc, copper, and vinegar
I filed one side of a penny to reveal the zinc; then I bent the coin and dropped it into a cup of white vinegar. Shortly afterward, many tiny bubbles were forming on the zinc side. Later on, I noticed ...
4
votes
1
answer
1k
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Can we use silver nitrate to distinguish between chloride and carbonate salts?
Initially, we are given a solution containing two salts, they can be either carbonate or chloride salts (we do not know their composition initially).
Generally, $\ce{AgNO3}$ is used as a confirmatory ...
- 802
7
votes
2
answers
182
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Removing sodium borate for the test proving thiocyanate ions
I've just learned that when carrying out the identification test for thiocyanate ions borax can induce a false positive and therefore needs to be removed. I couldn't find the answer on google so I'm ...
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0
votes
1
answer
1k
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How can I Identify Elements in Objects? [closed]
Since all objects on earth are composed of elements, how can I identify the fundamental make-up of objects such as trees, glass, bricks, wood, plastic, shoes, and other entitys?
- 11
2
votes
1
answer
52
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Taking a procedure for ICP and adapting it to use with AAS
I was reading a paper regarding metal detection and they gave their procedure for an acid digest of a soil sample which was then analysed by ICP-OES.
They used nitric acid, hydrogen peroxide and ...
1
vote
0
answers
476
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Determining the chemical formula of a polyiodide Salt
I've got a compound with formula $\ce{N(CH3)4.I(I2)_x}$. By mass I've got $\pu{0.138 g}$ of $\ce{I2}$ present out of $\pu{0.189 g}$ of polyiodide added. How do I find $x$?
This is the exact part of ...
- 19
1
vote
0
answers
99
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How does the electron configuration correlate with the emission spectrum of an ionic compound? [closed]
trying to find a way to correlate the electron configuration of an ionic compound (ie. Cupric sulfate, potassium chloride, Cupric chloride, sodium carbonate, strontium chloride) with its emission ...
2
votes
1
answer
832
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Heating organic compound in a stream of nitrogen gas
This is related to estimation of percentage of oxygen in an organic compound and my textbook states:
A definite mass of an organic compound is decomposed by heating in a stream of nitrogen gas.
I ...
- 3,487
4
votes
1
answer
2k
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Carius method for quantitative analysis of halogens
Carius method: A known mass of an organic compound is heated with fuming nitric acid in the presence of silver nitrate contained in a hard glass tube known as Carius tube, (Fig.12.17) in a furnace
I ...
user33495
3
votes
0
answers
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Lassaigne's test for sulfur
The sodium fusion extract is acidified with acetic acid and lead acetate is added to it. A black precipitate of lead sulphide indicates the presence of sulphur.
What is the need for acidification of ...
- 3,487
6
votes
1
answer
2k
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Why is copper (II) oxide used in quantitative analysis of carbon?
What is the significance of using cupric oxide in the quantitative analysis of carbon?
As far as I can tell from my research, only $\ce{CuO}$ is used to oxidize carbon to $\ce{CO2}$. Why can't we ...
- 3,487
1
vote
1
answer
605
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Detection of chloride anion
In a sample solution, containing $\ce{Cl-}$, while conducting the test for detection of $\ce{Cl-}$ ion first it is acidified with conc. $\ce{HNO3}$ then cooled and then $\ce{AgNO3}$ solution is added. ...
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