Lecture 19.3- Weak vs.Strong

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Section 19.3 Lecture for Prep Chemistry

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Lecture 19.3- Weak vs.Strong

  1. 1. BELLWORK- pH calcs <ul><li>Determine the pH of the following solutions. </li></ul><ul><li>[H + ] = 5.2x10 -9 M </li></ul><ul><li>[OH - ] = 4.9x10 -4 M </li></ul><ul><li>pOH = 5.7 </li></ul><ul><li>0.02M HNO 3 </li></ul><ul><li>0.10M NaOH </li></ul>
  2. 2. Strong acids and bases completely dissociate
  3. 3. <ul><li>AT EQUILIBRIUM </li></ul><ul><li>HCl + H 2 O  Cl - + H 3 O + </li></ul><ul><li>little lots lots </li></ul>Strong acids and bases completely dissociate
  4. 4. Weak acids and bases only partly dissociate.
  5. 5. <ul><li>When in water most of the weak acid will keep its proton attached. </li></ul>Weak acids and bases only partly dissociate.
  6. 6. <ul><li>When in water most of the weak acid will keep its proton attached. </li></ul><ul><li>Acetic acid(vinegar) is a weak acid. </li></ul>Weak acids and bases only partly dissociate.
  7. 7. <ul><li>When in water most of the weak acid will keep it proton attached. </li></ul><ul><li>Acetic acid(vinegar) is a weak acid. </li></ul><ul><li>AT EQUILIBRIUM </li></ul><ul><li>CH 3 COOH + H 2 O  CH 3 COO - + H 3 O + </li></ul><ul><li>lots little little </li></ul>Weak acids and bases only partly dissociate.
  8. 8. <ul><li>Which acid will produce more H+, </li></ul><ul><li>1M HCl or 1M acetic acid? </li></ul>
  9. 9. <ul><li>Which acid will produce more H+, </li></ul><ul><li>1M HCl or 1M acetic acid? </li></ul><ul><li>HCl is strong! </li></ul><ul><li>HC 2 H 3 COO is weak </li></ul>
  10. 10. Memorize this <ul><li>Recognize the name, formula, and relative strength (weak or strong) of the following: </li></ul><ul><li>STRONG ACIDS WEAK ACIDS </li></ul><ul><li>HCl hydrochloric acid CH 3 COOH </li></ul><ul><li>H 2 SO 4 sulfuric acid aka HC 2 H 3 O 2 or </li></ul><ul><li>HNO 3 nitric acid acetic acid (vinegar) </li></ul><ul><li>STRONG BASES WEAK BASES </li></ul><ul><li>NaOH sodium hydroxide NH 3 ammonia </li></ul><ul><li>KOH potassium hydroxide </li></ul>
  11. 11. <ul><li>A strong acid has a weak conjugate base. </li></ul><ul><li>A weak acid has a strong conjugate base. </li></ul><ul><li>A strong base has a weak conjugate acid. </li></ul><ul><li>A weak base has a strong conjugate acid. </li></ul>
  12. 12. Predict the products and label the conjugate acid-base pairs as weak or strong. <ul><li>NH 3 + HCl  _______ + _______ </li></ul><ul><li>CH 3 COOH + NH 3  _______ + _______ </li></ul>

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