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Acids and Bases - Titration

Acids and Bases - Titration. 19/01/12. Revision exercise. Acid An acid has a sour taste. Lemon juice is an example of an acid. An acid has a pH value between 0 and 7 Base Indicator Litmus pH. Stage 1.

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Acids and Bases - Titration

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  1. Acids and Bases - Titration 19/01/12

  2. Revision exercise • Acid • An acid has a sour taste. • Lemon juice is an example of an acid. • An acid has a pH value between 0 and 7 • Base • Indicator • Litmus • pH

  3. Stage 1 • Use the 10cm3 pipette and pipette filler to measure out 20cm3 of sodium hydroxide (NaOH) and put it in the conical flask • Make sure to match the bottom of the meniscus with the scale on the pipette.

  4. Stage 2 - Titration • Titrations are used to very accurately add a certain amount of an acid to a base. • Fill the burette accurately with 50cm3 of Hydrochloric acid (HCl) • Remember to line up bottom of meniscus 3 1 2

  5. Stage 3 - Evaporation • Place the resultant solution from the final titration into an evaporating dish • Put the dish on a gauze on a tripod • Heat the dish with a Bunsen burner until all the liquid is gone

  6. To titrate hydrochloric acid (HCl) against sodium hydroxide (NaOH) and prepare a sample of salt NaCl • For our experiment we are using 1M HCl with a pH value of 0 • And 1M NaOH with a pH value of 14 • We add the HCl to the NaOH • What do you think will happen to the pH value of the resulting solution?

  7. To titrate hydrochloric acid (HCl) against sodium hydroxide (NaOH) and prepare a sample of salt NaCl • Stage 1 • Stage 2 • Stage 3 3 1 2

  8. Discussion of results • We have just performed a neutralisation reaction. The addition of the HCl lowered the pH of the solution to 7 • Neutralisation • ACID + BASE = SALT + WATER • HCl + NaOH = NaCl + H2O • Can you think where this type of reaction might be useful in everyday life?

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