Is this an exothermic or endothermic reaction?

Question

Suppose you have (CoCl4 2+) + H2O (arrows for equilibrium) (Co(H2O)6 2+) + Cl- and CoCl4 2+ is blue and Co(H20)6 2+ is red. When you heat it up, it turns blue. Based on this, is this reaction exothermic or endothermic? Thanks!

Answer 1

In my opinion this is an exothermic reaction in the forward direction.

Equilibrium is disrupted when more reactants or products are introduced to the system. If the system is at equilibrium and more reactants are introduced, the forward reaction will occur at a more rapid rate than the reverse until equilibrium is reached again. A similar effect occurs if more product is introduced to the system (reverse rate occurs faster until equilibrium is achieved again).

Think of heat energy in terms of reactant/product. For an exothermic reaction, heat is a product. For an endothermic reaction, heat is a reactant.

In the above example, you added heat and the solution turned blue. It turned blue because more CoCl4 2+ was being produced. More CoCl4 2+ was being produced becaused the reverse reaction was occurring more rapidly than the forward reaction. Thus adding heat caused the system to shift from equilibrium such that the reverse reaction was favored. This means that adding heat had the same effect as adding product. The forward reaction must be exothermic.

Answer 2

If CoCl4 2+ is blue, and you heat it up and it turns blue, you are pushing the reaction back toward the reactants (CoCl4 2+)

You can think of it this way:

CoCl4 2+ + water <=> Co(H2O)6 2+ + Cl- + energy

The stress you are adding to the equilibrium system is added energy, so the system shifts to relieve the stress - back toward the reactants.

The forward reaction is exothermic. The endothermic reaction takes place when you add heat, and this is the reverse reaction which produces the blue compound.

Answer 3

Endothermic and Exothermic Reactions:---- Many chemical reactions launch ability interior the type of warmth, mild, or sound. those are exothermic reactions. Exothermic reactions would take position spontaneously and bring about higher randomness or entropy (?S > 0) of the equipment. they're denoted with the help of a unfavorable warmth bypass (warmth is lost to the ambience) and reduce in enthalpy (?H < 0). contained in the lab, exothermic reactions produce warmth or is also explosive. There are different chemical reactions that ought to take in ability with a view to proceed. those are endothermic reactions. Endothermic reactions can't take position spontaneously. paintings should be performed with a view to get those reactions to take position. at the same time as endothermic reactions take in ability, a temperature drop is measured in the course of the reaction. Endothermic reactions are characterised with the help of useful warmth bypass (into the reaction) and a upward push in enthalpy (+?H). Examples of Endothermic and Exothermic techniques Photosynthesis is an social gathering of an endothermic chemical reaction. in this procedure, plant life use the ability from the daylight to remodel carbon dioxide and water into glucose and oxygen. This reaction calls for 15MJ of ability (photo voltaic) for each kilogram of glucose it really is produced: photo voltaic + 6CO2(g) + H2O(l) = C6H12O6(aq) + 6O2(g) An social gathering of an exothermic reaction is the blend of sodium and chlorine to yield table salt. This reaction produces 411 kJ of ability for each mole of salt it really is produced: Na(s) + 0.5Cl2(s) = NaCl(s) Demonstrations you could carry out Many exothermic and endothermic reactions contain poisonous chemical compounds, severe warmth or chilly, or messy disposal procedures. those demonstrations are possibility-free and easy: * possibility-free Endothermic reaction * possibility-free Exothermic reaction * warm Ice - Exothermic reaction

Answer 4

This is a reversible reaction.

If heating it up changes the color, then heat is favoring the forward reaction.

It is endothermic