Cut to the Chase: Writing Reactions for Acid, Base, and Buffer Problems 1. Buffer problem: weak acid and conjugate base. Begin with weak acid. HF ↔ H + + F-2. A buffer to which a strong acid or base has been added. If a strong acid is added, the base part of the buffer reacts with the acid. If a strong base has been added, the acid part of the buffer reacts. Consider the buffer HF and NaF. Strong Acid HCl added: H + + F-→ HF Strong Base NaOH added: OH-+ HF → F-+ H 2 O 3. In titration problems, either a strong acid and base are reacted, or a strong acid or base with a weak acid or base are reacted. Strong Acid + Strong Base- HCl and NaOH: H + + OH-→ H 2 O Strong Acid + Weak Base- NH 3 and HCl: H + + NH 3 → NH 4
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