Question

A `"standard solution"` is `"aqueous"`, `"unsaturated"`, `"a mother solution"`?

Answer 1

None of your options is satisfactory........

Explanation:

A solution of known concentration, may be `"aqueous"`; it may be `"unsaturated"`; it may be a `"mother solution"` from which prepare various dilutions. You do know the solution `"concentration"`, i.e.

`"Concentation"="Moles of solute"/"Volume of solution"`.....

and typically we report the concentration with units of `mol*L^-1`.

Answer 2

Should be "Standard solution", shouldn't it?

Explanation:

None of the other possible answers work.

"Normal" means unit gram equivalent mass of solute per litre of solution.

"Aqueous" just means that the solvent is water.

"Original" means that a solution used to prepare other solutions by dilution.

"Unsaturated" means that the amount of solute dissolved is below the maximum amount that can be dissolved per unit volume.

"Standard solution" = a solution that contains a precisely known concentration of solute (in analytical terms anyway).