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Chem 12 Chapter 15 Pg 599-605, 608-611 • Acid-base titration is a process for calculating the concentration of a known volume of acid or base. ACID-BASE REACTIONS ACID-BASE REACTIONS Titrations Titrations ACID-BASE REACTIONS ACID-BASE REACTIONS Titrations Titrations H H 2 2 C C 2 2 O O 4 4 (aq) + 2 NaOH(aq) ---> (aq) + 2 NaOH(aq) ---> acid acid base base Na Na 2 2 C C 2 2 O O 4 4 (aq) + 2 H (aq) + 2 H 2 2 O(liq) O(liq) Carry out this reaction using a Carry out this reaction using a TITRATION TITRATION . . Setup for titrating an acid with a base Setup for titrating an acid with a base Sample Problem • In this sample titration, we are trying to determine the concentration of 20.00 mL of HCl. In the titration we will be neutralizing the HCl with 0.150 M NaOH. • Step 1: The NaOH, the titrant, is placed in the buret. The titrant is the solution of known concentration that is added from the buret. • Step 2: The HCl is placed in the Erlenmeyer flask along with approximately 20.00 mL of distilled water and 2-3 drops of phenolphthalein indicator. Since the solution in the flask is acidic, phenolphthalein is colourless. • Step 3: NaOH is added to the HCl in the flask. When the NaOH comes in contact with the solution in the flask, it turns pink and then the pink colour quickly disappears. This is because the OH- from the NaOH interact with the phenolphthalein to change the phenolphthalein from colourless to pink. • The solution becomes clear again as the hydronium ions from the hydrochloric acid neutralize the added hydroxide ions. As more NaOH is added, it takes longer for the pink colour to disappear. • As it starts taking longer for the pink colour to disappear, the sodium hydroxide is added a drop at a time. Acid-Base Titration [...]... 0.02000 L SAMPLE PROBLEM 2 • In an acid-base titration, 17.45 mL of 0.180 M nitric acid, HNO3, were completely neutralized by 14.76 mL of aluminium hydroxide, Al(OH)3 Calculate the concentration of the aluminium hydroxide SAMPLE ANSWER 2 • The balanced equation for the reaction is: 3HNO3(aq) + Al(OH)3(aq) → Al(NO3)3(aq) + 3H2O(l) • The number of moles of nitric acid used is: y mol = 0.180 mol/L x . 599-605, 608-611 • Acid-base titration is a process for calculating the concentration of a known volume of acid or base. ACID-BASE REACTIONS ACID-BASE REACTIONS. Titrations ACID-BASE REACTIONS ACID-BASE REACTIONS Titrations Titrations H H 2 2 C C 2 2 O O 4 4 (aq) + 2 NaOH(aq) ---> (aq) + 2 NaOH(aq) ---> acid acid