Solubility for Oxides and Hydroxides

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Discussion Overview

The discussion revolves around the solubility of oxides and hydroxides in water, as well as the terminology related to molecular geometry, specifically regarding bonding arrangements. Participants explore various aspects of solubility, including exceptions and definitions, while also addressing questions about geometric terms.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants inquire about lists of oxides or hydroxides that are soluble in water.
  • One participant asserts that solubility is not a binary property, suggesting that all hydroxides have some degree of solubility.
  • Another participant provides a perspective that most oxides are generally insoluble, with exceptions for certain metals and nonmetal oxides like sulfur trioxide.
  • There is a challenge to the definition of 'tetrahedral,' with a participant clarifying that it refers to a geometric arrangement rather than simply bonding to four atoms.
  • Participants suggest looking into molecular geometry and VSEPR Theory for further clarification on bonding arrangements.

Areas of Agreement / Disagreement

Participants express differing views on the solubility of oxides and hydroxides, with no consensus reached on the definitions and implications of solubility. The discussion on molecular geometry also shows varying interpretations of terms.

Contextual Notes

There are limitations regarding the definitions of solubility and molecular geometry, as well as the reliance on specific educational syllabi, which may not encompass all exceptions or nuances in the topic.

Kyoma
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Does anyone know any list of oxides or hydroxides that are soluble in water?

AND

If the term 'tetrahedral' means being bonded to 4 other atoms, are there other terms that mean being bonded to 3 atoms, 2 atoms, etc.?

Thanks.
 
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Kyoma said:
Does anyone know any list of oxides or hydroxides that are soluble in water?

The CRC handbook, for one.

If the term 'tetrahedral' means being bonded to 4 other atoms

No, it does not. Tetrahedral means tetrahedral, i.e. sharing some property in common with a tetrahedron, a geometric object.
A methane molecule is tetrahedral because the four hydrogen atoms are located at the corners of a tetrahedron.

See also "point groups".
 
Kyoma said:
Does anyone know any list of oxides or hydroxides that are soluble in water?

You are aware of the fact that solubility is not a TRUE/FALSE property? All hydroxides are to some extent soluble (especially if you are ready to accept fact that 10-10 g/L means that something has dissolved).
 
As far as your second question, you might want to google molecular geometry. That might be what you were wondering about.
 
Borek said:
You are aware of the fact that solubility is not a TRUE/FALSE property? All hydroxides are to some extent soluble (especially if you are ready to accept fact that 10-10 g/L means that something has dissolved).

Thanks for the second qns.

From the Internet, I have checked that all oxides are insoluble except calcium (sparingly), barium and Group 1 metals while all hydroxides are insoluble except ammonium, barium and Group 1 metals. (All this are based on the GCSE 'O' Level Syllabus). But the problem is, sulphur trioxide, a nonmetal oxide, is soluble in water to form sulfuric acid, so the qns is:

Are all nonmetal oxides soluble in water to form acids?
 
You may safely assume most oxides are insoluble - if they dissolve, that means they react with water. Product of the reaction can be either base or acid, depending on the oxide.
 
Kyoma said:
If the term 'tetrahedral' means being bonded to 4 other atoms, are there other terms that mean being bonded to 3 atoms, 2 atoms, etc.?

Google VSEPR Theory.
 

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