Talk:Solvation shell

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)

: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)

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.

$n\_s\; =\; (1\; -\; \backslash frac\; \{\backslash beta\}\{\backslash beta\_0\})\; \backslash frac\{n\_i\}\{n\_0\}$

where $\backslash beta$ and $\backslash beta\_0$ 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)

: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)

First step: definitions

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

$V\_h\; =\; V\_0\; \backslash frac\{n\_s\; n\_i\}\{n\_0\}$

b) the compressibility of pure water

$\backslash beta\_0\; =\; -\; \backslash frac\; \{1\}\{V\_0\}\; \backslash left(\backslash frac\{\backslash partial\; V\_0\}\{\backslash partial\; P\}\; \backslash right)\_\{T\}$

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

$\backslash beta\; =\; -\; \backslash frac\; \{1\}\{V\_0\}\; \backslash left(\backslash frac\{\backslash partial\; (V\_0-\; V\_h)\}\{\backslash partial\; P\}\; \backslash right)\_\{T\}$

d) final formula

$\backslash \; n\_s\; =\; (1\; -\; \backslash frac\; \{\backslash beta\}\{\backslash beta\_0\})\; \backslash frac\{n\_i\}\{n\_0\}$.--82.137.15.250 (talk) 20:25, 20 October 2016 (UTC)

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)

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)

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:

:$z\; =\; \backslash frac\{\backslash rho\; -\; \backslash rho\_0\; \backslash frac\{\backslash beta\}\{\backslash beta\_0\}\; -\; \backslash varrho\_1\}\{\backslash varrho\_1\}\; \backslash frac\{M\}\{M\_0\}$

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)

A list of articles re solvation number of ions:

• [https://link.springer.com/chapter/10.1007/0-306-46909-X_2]

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