All glassware must be dry when preparing the equilibrium solution because the complex tetrachlorocobaltate(II) ion reacts with water and tries to form another complex ion.
This is referred to as a type of ion which has more than one atom and usually has a metal ion at its center with the other molecules or ions surrounding it.
When the experiment is being performed in the laboratory, it is best for the glassware to be dry because the complex tetrachlorocobaltate(II) ion reacts with water and tries to form another complex ion and will lead to an inaccurate result being gotten.
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