Talk:Solvation shell

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The content of Wrapping technology was merged into Solvation shell on 03 December 2014. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. For the discussion at that location, see its talk page.

The content of Dehydron was merged into Solvation shell on 5 December 2014. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. For the discussion at that location, see its talk page.

Solvation number

Latest comment: 10 years ago8 comments7 people in discussion

I see that some section containing a calculation of the solvation number has been removed due to being unreferenced. I think a cn tag could have been placed instead of removing the useful content.--85.121.32.1 (talk) 08:42, 8 August 2016 (UTC)Reply

Please see WP:BURDEN. Do not restore unsourced content without adding a source. I've pasted it below. Jytdog (talk) 00:33, 14 August 2016 (UTC)Reply

Unsourced

The following is unsourced. Cut from article and pasted here per V

Solvation number

The solvation number could be determined from the compressibility of the solvent and solution.

$n_{s} = (1 - \frac{β}{β_{0}}) \frac{n_{i}}{n_{0}}$

where $β$ and $β_{0}$ denote compressibilities of solution and the solvent and $n_{i}$ and $n_{0}$ the amounts of solvate and solvent.

- Jytdog (talk) 00:32, 14 August 2016 (UTC)Reply

The proof steps of this formula can be mentioned here (as mentioned in a Romanian language source which does not make further reference to other language sources). It remains that this formula be harmonized with the below mentioned formula from a Russian source that is also mentioned in another Romanian source where I've encountered without proof.--82.137.9.151 (talk) 18:58, 20 October 2016 (UTC)Reply

First step: definitions

a) the hydration water as a fraction of the total amount of water

$V_{h} = V_{0} \frac{n_{s} n_{i}}{n_{0}}$

b) the compressibility of pure water

$β_{0} = - \frac{1}{V_{0}} {(\frac{\partial V_{0}}{\partial P})}_{T}$

c) the compressiblity of the water in solution excluding the hydration shell water

$β = - \frac{1}{V_{0}} {(\frac{\partial (V_{0} - V_{h})}{\partial P})}_{T}$

d) final formula

$n_{s} = (1 - \frac{β}{β_{0}}) \frac{n_{i}}{n_{0}}$ .--82.137.15.250 (talk) 20:25, 20 October 2016 (UTC)Reply

Final steps: substitutions of Vh/(solvation number) from the first definition and the compressibility of the pure solvent/water from the second definition into the third relation and some rearrangements give the final formula.--82.137.14.98 (talk) 20:58, 20 October 2016 (UTC)Reply

Several formulae harmonization

It seems that there are several derivations which need harmonization. A supplementary formula and derivation is to be found in a Russian language source which waits to be checked as discussed on User talk:R8R Gtrs#Hidration.--82.137.10.242 (talk) 08:29, 6 October 2016 (UTC)Reply

The following formula (from a Romanian source which points to a Russian source) about solvation shell the solvation number z (or n_s), densities rho and compressibilities beta, molar masses of water and solution M, M0 and the mass concentration varrho of the dissolved ionic compound:

z = \frac{ρ - ρ_{0} \frac{β}{β_{0}} - ϱ_{1}}{ϱ_{1}} \frac{M}{M_{0}}

needs to be harmonized with the first formula from above. The harmonization has to lead to a unique equation or to show the connection/interconversion between the two equalities.--82.137.15.79 (talk) 19:09, 20 October 2016 (UTC)Reply

Sources list

Latest comment: 6 years ago1 comment1 person in discussion

A list of articles re solvation number of ions:

--185.53.198.232 (talk) 03:36, 17 November 2019 (UTC)Reply