Presentation on theme: "Neutralization Reactions Reaction that occurs between an acid and a base. Example: HCl + NaOH NaCl + H 2 O & Water Products always include: A “Salt”"— Presentation transcript:
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 2 2 2 Always H 2 O Then Mg +2 and Cl -1 (Ionic charges!)
Neutralization Reactions Example: If it takes 30.0 mL of 0.100 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
= 0.00300 mol NaOH 0.100 mol NaOH 0.0300 L 1.00 L 1:1 Ratio of NaOH & HCl… Then there is 0.00300 mol HCl too.
Since this is a strong acid which turns completely into [H 3 O + ]… pH = -log[0.120] moles Molarity = Liters = 0.00300 mol HCl 0.0250 L M = 0.120 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!) [http://upload.wikimedia.org/wikipedia/commons/6/69/Titration.gif]
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 - [http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/FG18_09.JPG]