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Brønsted -Lowry Model

Brønsted -Lowry Model. Acids - proton (H + ) donors Bases – accepts proton (H + ). Brønsted -Lowry Model. A Br ø nsted -Lowry acid is a proton donor A Br ø nsted -Lowry base is a proton acceptor. Proton = Hydrogen ion = H +.

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Brønsted -Lowry Model

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  1. Brønsted-Lowry Model Acids - proton (H+) donors Bases – accepts proton (H+)

  2. Brønsted-Lowry Model • A Brønsted-Lowry acid is a proton donor • A Brønsted-Lowry base is a proton acceptor Proton = Hydrogen ion = H+

  3. The Brønsted definition means NH3 is a BASE in water — and water is itself an ACID H+ H+ H+

  4. Can you see how the HCl gives up a proton (H+) to the H2O?

  5. Acid donates the proton (H+), base accepts it.Which is the acid and which is the base in the forward reaction? CH3CO2H  +  H2O  ⇌  H3O+  +  CH3CO2- CH3CO2H (acetic acid) – proton donor H2O (water = base) – proton acceptor

  6. Brønsted-Lowry Model • Amphoteric – something that can act as an acid or a base. • Water is acting as both an acid and a base Base Acid Acid Base

  7. Conjugate Pairs • Conjugate Pairs • NH3, NH4+ • H2O, OH- Base Pairs to Acid Acid Pairs to Base

  8. What are the conjugate acid base pairs?HCl + H2O ⇌ H3O+ + Cl- HCl (acid), Cl- (base)H2O (base), H3O+ (acid)

  9. Conjugate Pairs

  10. Learning Check! Label the acid, base, conjugate acid, and conjugate base in each reaction: HCl + OH-Cl- + H2O H2O + H2SO4   HSO4- + H3O+

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