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The effect of concentration on chemical equilibrium (observation)

The effect of concentration on chemical equilibrium (observation)

Examining the colour of cobalt(II) chloride in water and hydrochloric acid.

02:30

Chemistry

Keywords

balance, chemical equilibrum, concentration, cobalt chloride, water, hydrochloric acid, komplex, chlorocomplex, aquacomplex, complex formation, aqua complex, chloro complex, akvakompley, colour change, water of crystallisation, anhydrous, heating, solution, compound, evaporating dish, Bunsen burner, chemical, general chemistry, chemical process, chemical reaction, chemistry

On-screen labels

Cobalt(II) chloride CoCl₂ ∙ 6H₂O, Concentrated hydrochloric acid HCl, Water H₂O, Step 1: Heat cobalt(II) chloride in an evaporating dish with a Bunsen burner., After a while, the pink crystals will turn blue. Why does the colour change?, Step 2: Pour a spoonful of blue cobalt(II) chloride into water., The colour of the resulting solution is pink. What do you think causes this colour change?, Step 3: Pour some cobalt(II) chloride into hydrochloric acid., The colour of this solution is blue. What happens to the cobalt(II) chloride in the hydrochloric acid?, Step 4: Add concentrated hydrochloric acid to the pink solution and water to the blue one. Observe how the colours of the solutions change., Why do you think the colours of the solutions change?
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