1 / 3

Using K values to predict reactions between different acids and bases.

Using K values to predict reactions between different acids and bases. HF + CH 3 COO - F - + CH 3 COOH. eg:. Given the following acid base equilibrium, is the forward or reverse reaction favoured ?. Compare the strengths of the two acids:. HF & CH 3 COOH. K A (HF) = 3.5x10 -4.

pandora-case
Télécharger la présentation

Using K values to predict reactions between different acids and bases.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Using K values to predict reactions between different acids and bases. HF + CH3COO-F-+ CH3COOH eg: Given the following acid base equilibrium, is the forward or reverse reaction favoured? Compare the strengths of the two acids: HF & CH3COOH KA (HF) = 3.5x10-4 KA (CH3COOH) = 1.8x10-5 Because KA (HF) > KA (CH3COOH) the forward reaction is favoured. (at equilibrium there will be more products than reactants.) Note: you could also compare KB values for the two bases and you would get the same result.

  2. HCO3- + HSO3- ? HCO3- + HSO3-H2CO3 + SO32- eg: If HCO3- is combined with HSO3- a) Write the equation for the equilm reaction which results. KA (HCO3-) = 5.6x10-11 KA (HSO3-) = 1.0x10-7 KA (HSO3-) > KA (HCO3-) • HSO3- acts as an acid.

  3. HCO3- + HSO3- H2CO3 + SO32- b) In this equilm, are the reactants or products favoured? base acid acid base Compare acid in each direction KA (HSO3-) = 1.0x10-7 KA (H2CO3) = 4.3x10-7 KA (H2CO3) > KA (HSO3-) • Reactants are slightly favoured.

More Related