HELP PLEASE! Why does the solution need to be cooled before adding it to the aci

Question

HELP PLEASE! Why does the solution need to be cooled before adding it to the acid?

Compound Reaction Overview In this experiment you will react a cobalt (II) chloride solution (to which has been added ammonium chloride) with concentrated am- monia which is a complexing agent. In the absence of a complexing agent the oxidation of [Co (H20)sl+2 would be unfavourable. Yo will then slowly add hydrogen peroxide and gently heat the solution H202 will oxidize Cot2 to Co+3, and heating will remove any excess H202. Then you will chill the solution and react it with concentrated hydrochloric acid. After the addition is complete you will heat and stir the solution until a precipitate forms. You will then chill the olution and filter the precipitate under vacuum filtration. Chilling the solution will lower the solubility of the precipitate and increase the yield.

Explanation / Answer

Solution:- the solution of Cobalt is in water, in that solution we have to add concentrated HCl. The reaction of HCl with water means dilution of concentrated acid is highly exothermic reaction ( heat will evolve ) and in that step also, we are adding concentrated HCl to the aqueous solution of cobalt so this step will be exothermic hence to maintain the temperature and to stop any accident the solution is cooled before adding HCl . After the compleat addition we can start heating.

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