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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Thursday, August 16, 2012

Mass Spectroscopy of Mono-Cation of Chlorine Gas

Talking about mass spectroscopy, Mass spectrometry (MS) is an analytical technique that measures the mass-to-charge ratio of charged particles. It is used for determining masses of particles, for determining the elemental composition of a sample or molecule, and for elucidating the chemical structures of molecules, such as peptides and other chemical compounds. MS works by ionizing chemical compounds to generate charged molecules or molecule fragments and measuring their mass-to-charge ratios.

Now, there's a question: How is the mass spectroscopy of Cl2+ ion?
Okay, I'll try to answer it as I can because honestly, I'm not learning about it yet.

As we know that Chlorine consists of Cl-35 and Cl-37 isotopes where the relative abundance percentage of each isotopes are 75% for Cl-35 and 25% for Cl-37. Now, we have to make a diatomic molecule of chlorine. From the data above, we will need to make a probability calculation for this problem.

Make a probability tree and if we try to connect 35Cl2+ ,[35Cl37Cl]+, and 37Cl2+, we will find that the probability ratio of these compounds is 9 : 6 : 1. These ratio will show the height of the peak for each compounds.

Now for the Mr:
1. 35 + 35 = 70
2. 35 + 37 = 72
3. 37 + 37 = 74

Don't think because the question is about the mass spectroscopy of Cl2+ ion, we have to consider it to our calculation about the Mr. Remember, electron's mass is neglected and we don't add any hydrogen species in this problem.

For the last, remember for the fragmentation. It will make Cl-35 and Cl-37 ions  be detected into our mass spectroscopy result.

In summary, the mass spectroscopy result of Cl2+ ion is as follows:

 
(http://www.chemguide.co.uk)

Source:
Wikipedia
Fessenden and Fessenden. Organic Chemistry.
Thank You

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