[duo maxwell]

Had problems with the questions attached.
Need a directioning of how to solve this kind of questions.
I'll thank you for any help.

[billnotgatez]

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[duo maxwell]

You have to show your attempts or thoughts at solving the question to receive help.
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Sorry, and thank you for the information.
I'm attaching what I did in the question about the precentage of specific shape on alanine.
In the other one I just don't know the connection between pKa and dissolvability,
and will find any equation, instruction or reading material in this subject useful.

[Babcock_Hall]

With respect to solubility, I would think in terms of intermolecular forces, including ion-dipole forces.

[duo maxwell]

With respect to solubility, I would think in terms of intermolecular forces, including ion-dipole forces.

If I understand it right, the Benzoic acid is more dissolvable in NaOH,
because of the dipole created by very electronegative element,
and the Pyridine ion is more dissolvable in HCl because in water there might be Cl-,
and it attracts H+ while the N+ already needs the electrons of the H too.

[Babcock_Hall]

I don't know what you mean by a very electronegative element.  Ion dipole forces in water are the attractive forces between a positively charged ion and the negative dipole of water, or the attractive forces between a negatively charged ion and the positive dipole of water.  I would not focus on the counterions (sodium or chloride), although they are not entirely irrelevant, either.