Methyl orange indicator was used in the chromate ion equilibrium illustrated bel

Question

Methyl orange indicator was used in the chromate ion equilibrium illustrated below. Explain what changes would be observed in this reaction upon the addition of sulfuric acid. 2 CrO_4^-2(aq, yellow) + 2 H_3O^+(aq) doubleheadarrow Cr_2O_7^2-(aq, orange) + 3 H_2O(I) In an exothermic reaction is heat considered a product or a reactant? What physical change would indicate that a reaction was exothermic? For the following equilibrium list 2 changes that will favor the formation of reactants? 3H_2(g) + N_2(g) doubleheadarrow 2NH_3(g) DeltaH= -92 KJ/mol

Explanation / Answer

Solution:

1) chromate ions are converted to dichromate ions in the presence of an acid.

2) In exothermic reactions Reactant-heat=Product or Reactant =Product+heat

   If Delta H is negative it is a exothermic reaction.

3) If the concentration of ammonia increases the formation of reactants are increases.

If the pressure is decreases the reaction takes place from low no of moles to more no of moles, i,e backward reaction is favarouble

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