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Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
Strong/Weak_Acid/Base
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Strong/Weak_Acid/Base

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  • 1. Ch 18 & 19 – Acids and Bases Strong, Weak and Concentrated
  • 2. Definitions <ul><li>Strong: completely dissociated into ions </li></ul><ul><li>Weak: Only slightly dissociated into ions </li></ul>
  • 3. Definitions <ul><li>Concentrated: A high number of moles of solute per liter of solution </li></ul><ul><li>Dilute: A low number of moles of solute per liter of solution </li></ul><ul><li>* An acid/base can be strong and dilute or weak and concentrated, etc… </li></ul>
  • 4. Strong &amp; Weak Acids/Bases <ul><li>Strong Acids: HCl, HNO 3 , H 2 SO 4 , HBr, HI, HClO 4 </li></ul><ul><li>Weak Acids: all others </li></ul><ul><li>(ex:HF, CH 3 COOH, H 3 PO 4 , H 2 CO 3 , HCN) </li></ul><ul><li>Strong Bases: Group 1 Hydroxides (ex; NaOH) and lower group 2 hydroxides (ex: Ba(OH) 2 ) </li></ul><ul><li>Weak Bases: all others (ex: NH 3 ) </li></ul>
  • 5. Distinguishing between Strong and Weak Acids/Bases <ul><li>pH measurement of two substances of same molarity (strong acids/bases dissociate more and have more extreme pH) </li></ul><ul><li>Conductivity measurement of two substances of same molarity (strong acids/bases have higher conductivity) </li></ul><ul><li>Rate of reaction: strong acids/bases will react more vigorously and produce more products </li></ul>
  • 6. Acidic and Basic Salts <ul><li>Salts dissociate in water </li></ul><ul><li>Some of these ions are weak acids or bases </li></ul><ul><li>To predict if acidic or basic salt must look at the acid and base that forms the salt </li></ul>
  • 7. Neutral Salt <ul><li>Formed from a strong acid and strong base </li></ul><ul><li>NaOH + HCl -&gt; NaCl + H 2 O </li></ul><ul><li>strong strong neutral </li></ul><ul><li>base acid </li></ul>
  • 8. Acidic Salt <ul><li>Formed from strong acid and weak base </li></ul><ul><li>NH 3 + HCl -&gt; NH 4 Cl </li></ul><ul><li>weak strong acidic </li></ul><ul><li>base acid </li></ul><ul><li>Salt dissociates to form hydronium ions </li></ul><ul><li>NH 4 Cl -&gt; NH 4 + + Cl - </li></ul><ul><li>NH 4 + + H 2 O -&gt; H 3 O + + NH 3 </li></ul>
  • 9. Basic Salts <ul><li>Formed from strong base and weak acid </li></ul><ul><li>H 2 CO 3 + NaOH -&gt; Na 2 CO 3 </li></ul><ul><li>weak strong basic </li></ul><ul><li>acid base </li></ul><ul><li>Salt dissociates to form hydroxide ions </li></ul><ul><li>Na 2 CO 3 -&gt; Na + + CO 3 2- </li></ul><ul><li>CO 3 2- + H 2 O -&gt; OH - + HCO 3 - </li></ul>

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