AcidBase Review - Acid/Base Equilibria Strong acids ionize...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Acid/Base Equilibria Strong acids ionize completely in water: The conjugate base of a strong acid is a very weak base. Weak acids do not ionize completely in water: The conjugate base of a weak acid is strong enough to ionize water: HCN (aq) + H 2 O ( l ) H 2 O –H + (aq) + CN - (aq) HNO 3 (aq) + H 2 O ( l ) H 2 O –H + (aq) + NO 3 - (aq) none left at equilibrium A LOT left at equilibrium CN - (aq) + H 2 O ( l ) H CN (aq) + OH (aq) A LOT left at equilibrium
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Acid-Base Titrations In an acid - base titration , the titrant OH - of known concentration is used to react with a solution of the analyte HA , whose concentration is not known in advance. We can use a plot of pH vs. vol of OH - added to find… concentration of HA Ka of a weak acid Equivalence point (or stoichiometric point) : when moles of OH - added equals moles of HA originally present. At equivalence, the acid has been “neutralized.” NaOH HA The shape of the curve and the pH at the eq. point depends on the strength of the acid.
Background image of page 2
Strong Acid / Strong Base HCl( aq ) + NaOH( aq ) ! NaCl( aq ) + H 2 O @ eq. pt: Cl - , Na + , H 2 O before eq pt: H 3 O + , Cl - , Na + , H 2 O after eq. pt : OH - , Na + , Cl - , H 2 O HCl NaOH
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
HA( aq ) + NaOH( aq ) "! NaA( aq ) + H 2 O @ eq. pt: Na + , H 2 O, A - before eq pt: HA, A - , H 3 O + , Na + , H 2 O after eq. pt : OH - , A - , Na + , H 2
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/18/2012 for the course CHEM 152B taught by Professor Zhang during the Winter '12 term at University of Washington.

Page1 / 19

AcidBase Review - Acid/Base Equilibria Strong acids ionize...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online