Answer:
To make a sample of cobalt chloride crystals from cobalt oxide and dilute hydrochloric acid, follow the steps below:
Add cobalt oxide to dilute hydrochloric acid in a beaker or flask. Stir the mixture to ensure the cobalt oxide is well distributed in the acid.
Heat the mixture gently, stirring constantly, until all of the cobalt oxide has dissolved in the acid.
Filter the solution to remove any impurities.
Slowly add hot distilled water to the solution, stirring continuously, until the solution is saturated (i.e., no more cobalt chloride can dissolve in the solution).
Set the solution aside to cool. As the solution cools, cobalt chloride crystals will begin to form.
Once the solution has cooled completely, remove the cobalt chloride crystals from the solution using a filter or other method.
Rinse the crystals with distilled water to remove any remaining impurities.
Dry the cobalt chloride crystals thoroughly by placing them on a paper towel or in an oven at low temperature.
Step-by-step explanation: