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Warn­ing! Sub­stances of this ex­per­i­ment are tox­ic and high­ly dan­ger­ous for your health. The cobalt so­lu­tion is car­cino­genic - in the case of con­tact with skin, wash it away with wa­ter. When car­ry­ing out the ex­per­i­ment, wear gloves and pro­tec­tive glass­es. This is be­cause the chlo­rine ions force the wa­ter out of the wa­ter com­plex of cobalt. Adding con­cen­trat­ed hy­drochlo­ric acid to the so­lu­tion changes the col­or of the so­lu­tion to bluish-pur­ple. Cobalt ions are hy­drat­ed in the so­lu­tion and have a pink col­or. The cobalt chlo­ride changes col­or be­cause the salt in the so­lu­tion dis­so­ci­ates into ions. If you add wa­ter to the bluish-pur­ple so­lu­tion, it will be­come pink again, while if you add con­cen­trat­ed hy­drochlo­ric acid to the sec­ond so­lu­tion, it will be­come bluish-pur­ple. Pour dis­tilled wa­ter into one glass, and con­cen­trat­ed hy­drochlo­ric acid into the sec­ond – the col­or of the so­lu­tion will change to bluish-pur­ple. Understanding: A solution of cobalt (II)chloride is a lovely pink color.

Add water to the solution and observe transformation in color of solution. Add hydrochloric acid to the solution and observe change in color. Pour the ob­tained so­lu­tion into two glass­es. Prepare a solution of cobalt chloride in 98 ethyl alcohol. This classic Le Châtelier’s Principle lab explores the reversible chemical reaction: Students experiment with shifting the equilibrium and observing the colour change by. When reactants predominate, the solution looks pink and when products predominate, the solution looks blue. Dis­solve 10 g of cobalt chlo­ride (II) in 100 ml of wa­ter. The blue colour is the result of cobalt chloride complex ions (CoCl 42) in less dense acetone.