Neutralization Reactions Reaction that occurs between an acid and a base. Example: HCl + NaOH  NaCl + H 2 O & Water Products always include: A “Salt”

Neutralization Reactions Example: HCl + Mg(OH) 2  H2OH2O+ MgCl Always H 2 O Then Mg +2 and Cl -1 (Ionic charges!)

Neutralization Reactions Example: If it takes 30.0 mL of M NaOH to neutralize 25.0 mL of HCl, what was the pH of the HCl? HCl + NaOH  H 2 O + NaCl 1:1 mole ratio for HCl & NaOH

= mol NaOH mol NaOH L 1.00 L 1:1 Ratio of NaOH & HCl… Then there is mol HCl too.

Since this is a strong acid which turns completely into [H 3 O + ]… pH = -log[0.120] moles Molarity = Liters = mol HCl L M = mol/L = 0.921

Titrations Lab reaction where a known acid or base is added to an unknown acid or base to find the concentration (pH!) [

Titrations Commonly, a known base is added to the burette. An unknown acid is added to flask with an indicator.

Titrations The base is added until the equivalence point is reached. Moles H 3 O + = Moles OH - [