c161l9_09_22 - Weak bases Weakly soluble hydroxides Many...

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Weak bases Weak bases W Weakly soluble hydroxides W Many nitrogen-containing molecules NH 3 and its derivatives (amines) CH CH 3 NH NH 2 (CH (CH 3 ) 2 NH NH (CH (CH 3 ) 3 N Hydrazine H 2 NNH NNH 2
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Neutralizations Neutralizations W Reactions between acids and bases are called neutralizations W Strong Write in dissociated form W Weak Leave together
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What What s in the solution? s in the solution? W Strong acids dissociate completely HCl(aq) contains only H + and Cl - W Weak acids don’t CH 3 COOH(aq) stays as CH 3 COOH
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Neutralization Neutralization W Reaction of an acid with a base W Product are (usually) water and ions (not salt) W Example HCl(aq) + NaOH(aq) H 2 O(l) + NaCl(aq) Net ionic H 3 O + (aq) + OH - (aq) 2 H 2 O(l) CH 3 COOH(aq) + NH 3 (aq) NH 4 + (aq) + CH 3 COO - (aq) W Most titrations are neutralizations (see next)
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Example Example W Determine the concentration of oxalic acid (H 2 C 2 O 4 ) if 25.00 mL of oxalic acid is titrated against 0.500M NaOH and it took 38.0 mL to reach the equivalence point. Step 1: H 2 C 2 O 4 (aq)+2NaOH(aq) Na 2 C 2 O 4 (aq)+ H 2 O(l) Step 2: 38.0mL×0.500mol/L = 19.0 mmol NaOH used Step 3: 19.0 mmol NaOH × 1 mol H 2 C 2 O 4 /2mol NaOH = 9.5 mmol H 2 C 2 O 4 Step 4: 9.5 mmol H 2 C 2 O 4 / 25.00 mL = 0.380 mol/L
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Concentation Concentation W Units of concentration mass % (w/w) volume % (v/v) molar concentration
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Molarity Molarity W The most common unit of concentration is molarity (M). W It is defined as the number of moles of solute per liter of solution. ) ( ) ( L solution of volume solute moles M Molarity =
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Example Example W A solution is made by dissolving 0.180g of glucose in enough water to make 100mL.
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c161l9_09_22 - Weak bases Weakly soluble hydroxides Many...

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