Oxidation of Bromide Ions by Hydrogen Peroxide in Aqueous Solutions | CHEM 113, Study notes of Chemistry

Download Oxidation of Bromide Ions by Hydrogen Peroxide in Aqueous Solutions | CHEM 113 and more Study notes Chemistry in PDF only on Docsity! 4 February Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution H+ + HOOH ↔ H2OOH + (fast) H2OOH + + Br- → HOBr + H2O (slow) HOBr + H+ + Br- → Br2 + H2O (fast) Write an overall reaction for this process 2H+ + HOOH + 2Br- → Br2 + 2H2O Propose a rate law for the overall reaction that is consistent with the mechanism. Rate = k [H2OOH +][Br-] Rate = k [Br-][H+][HOOH] Catalyst: a substance that increases the rate of a chemical reaction without being consumed in the reaction Acts by lowering the activation energy Lower activation energy = larger k Larger k = faster rate Activation energy is lower because a catalyst provides a different mechanism Homogeneous vs heterogeneous catalyst Same phase as reactants? Yes – homogeneous No - heterogeneous