All Questions
Tagged with elemental-analysis inorganic-chemistry
19
questions
0
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0
answers
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Cobalt Nitrate Test
As,
$$\ce{ZnCl2 + Na2CO3 -> ZnCO3 + 2 NaCl}$$
$$\ce{ZnCO3 -> ZnO + CO2}$$
$$\ce{Co(NO3)2 -> CoO + 2NO2 +\frac{1}{2}O2}$$
Hence, $\ce{CoO + ZnO -> CoZnO2}$
here, $\ce{Zn_{1-x}Co_xO2}$ (...
- 101
16
votes
3
answers
2k
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How can I identify the material of this mystery gear?
I have this small gear which has sat on my desk for a couple years. I can't remember where it originally came from or what material it's made out of, so I'm hoping you can help me solve this mystery.
...
- 319
-1
votes
1
answer
62
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Reactivity in my standard solution of Cu, P, Al, Ca, Fe, K, Mg, Mn, Na and S in 7,8% HNO3 and H2O2
I have a problem with my standard for ICP-OES. It contains the following elements Cu, P, Al, Ca, Fe, K, Mg, Mn, Na and S in a solution of 7,8% HNO3 and H2O2.
I cannot make it work for reading P and ...
- 19
9
votes
2
answers
1k
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Why are sulfites often ignored in soil studies?
From a document on soil chemistry that I am reading:
The acid-base potential of a soil takes soil pH, total sulfur (sulfides and sulfates), and neutralization potential into account to determine the ...
- 435
1
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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
-3
votes
1
answer
526
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Cant figure out whether Lithium or Strontium is in my substance? [closed]
So for uni I got a substance and I have to basically figure out which anions and cations are in it. I get two chances to guess otherwise I get a new substance and have to start from scratch.
Anyway ...
- 11
0
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2
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2k
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How much Na2O (from NaOH) do I add to sodium silicate with a weight ratio of SiO2/Na2O = 2.34 to get the solution to a weight ratio SiO2/Na2O = 1.9?
There is some confusion in industry as sodium silicate is made with NaOH but given a ratio with respect to Na2O (i.e. SiO2/Na2O not SiO2/NaOH). I presume it follows from this equation:
2NaOH -> ...
- 500
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
2
votes
1
answer
73
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Free refined value in Rietveld
I have a question about Rietveld refinement
The author of this paper claimed that the free refined CN ligand is 1.081.
However, they does not show how they got that number. They stated it was based ...
- 93
7
votes
1
answer
454
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Determining stoichiometry in ICP-OES data analysis
I have questions regarding data analysis for an inductively coupled plasma (ICP) experiment from a paper by Wang et al. [1].
The generic formula for the chemical compound is $\ce{Na_{2−x}Fe[Fe(CN)6]}$...
- 93
1
vote
1
answer
197
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Arsenic bound proteins confirmatory test
I want to confirm the presence of arsenic in some protein samples, apart from the marsh test can I use the following method?--
Arsenic is present as arsenic (III) ion in the samples. Hydrogen sulfide ...
- 313
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 ...
- 748
0
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2
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3k
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Sodium Sulfate vs Sodium Sulfite
I recently took a test and one of the questions was:
Which procedures will allow a student to differentiate between solid sodium sulfate and solid sodium sulfite?
I. Make solutions of each ...
- 2,109
1
vote
1
answer
669
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metal oxide analysis
I am looking in to analytical techniques for a future project. I may have a mixture of metals, i.e. an alloy, which I am thinking XRF spectroscopy would be the best quantitative technique. I could ...
- 338
2
votes
1
answer
255
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Reagents used to prepare organic ICP standards, from scratch
I am trying to figure our how I can make my own calibration standards for organic ICP analysis. I assume that I need organometallic compounds to mix with base-oil/mineral-oil to prep the standards, ...
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