In an aqueous chloride solution cobalt(ii) exists in equilibrium with the complex ion cocl42-. co2+(aq) is pink and cocl42-(aq) is blue. at low temperature the pink color predominates. at high temperature the blue color is strong. if we represent the equilibrium as: +(aq) + 4cl-(aq) cocl42-(aq) we can conclude that: 1. this reaction is: a. exothermic b. endothermic c. neutral d. more information is needed to answer this question.

b. Endothermic

Explanation:

Hello,

By considering the equilibrium chemical reaction:

The Le Chatelier's principle states that if the temperature for endothermic chemical reactions is increased the equilibrium will shift rightwards, in such a way, as at high temperatures the blue color, corresponding to the complex, predominates, this behavior assures the chemical reaction as endothermic.

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the atomic mass is the bottom number on the element.

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