Login

why metal oxides are soluble in water ??

Only those metal oxides of the non-acidic and feebly acidic cation dissolve in water. Because these oxides introduce significant amount of O2- ion into the solution so that hydroxide ions are produced. Example: of feebly acidic oxide.

 CaO+  H2O   Ca (OH) 2

Reaction is reversible at 853K,

Example: of weakly acidic oxide,

FeO + 2 H3O+ (aq)    Fe2+ (aq) + 3 H2O

Acidic and weakly acidic oxides are insoluble in water

  • 0
View Full Answer

What’s the difference among solute, solvent, solution, and solubility?

Solubility means the how well something (solute) can dissolve in something else (solvent). Usually, we call the disolvee, the solute since it is less (mnemonic acute and solute). The disolver is the one usually with greater volume, so that’s called the solvent. Together, the solvent and solute combine give you a solution.

For example, we can add salt, NaCl, a (solute) into water H2O (solvent). If we put the NaCl into our water, it will dissolve by breaking into its elements Na and Cl. The feasibility of them dissolving (solubility) is about —. Other examples of solutes in water are sugar, food coloring, alcohol, etc.

What aren’t water soluble and the exception?

1. Metal oxides are NOT soluble in water EXCEPT alkali metal oxides and oxides with Ba, Ca, and Sr.

  • oxides – those with oxygen (O)
  • metal oxides – metal with O
  • alkali metal oxides – alkali metal + O

2. Hydroxides (-OH) are NOT soluble, EXCEPT if it were with alkali metals or Ba, Ca, and Sr

3. All sulfate salts ARE soluble EXCEPT ones with Ba, Ca, Sr

See the periodic table for more info on the elements.

  • 1
What are you looking for?