when a certain compound was he
when a certain compound was heated in a test tube, itchanged from red to blue and water formed on the colder parts ofthe test tube. solutions of both the original salt and the residuewere pink. is the compound a true hydrate or not? briefly explainyour answer
Answer:
# Cobalt (II) chloride hexa hydrate is red in color in a solidstate.
# If we heat the salt . dehydration takes place.
#Therefore , color change takes place due to change ingeometry
#Aqueous solutions of both CoCl2 and the hydratecontain the species[Co(H2O)6]2+
# [Co(H2O)6]2+ -Pink colour
The above equilibrium reaction is weakly endothermic,DrHo > 0 which means that heat is absorbedduring this substitution process. According to the Le Chatelier’sprinciple, if a chemical dynamic equilibrium is disturbed bychanging the conditions (concentration, temperature, volume orpressure), the position of equilibrium moves to counteract theimposed change. If we apply the Le Chatelier’s principle to thisparticular case, we can conclude that heating the pinkhexaaquacobalt(II) complex will shift theequilibrium to the right, in order to absorb this energy. Duringthis equilibrium shiftingbluetetrachlorocobaltate(II) complex is formed.Contrary, cooling down the hot solution leads to the blue complexdecomposition and formation of pinkhexaaquacobalt(II) complex – the reaction isreversible.
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