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Acid / Alkali Neutralisation

Acid / Alkali Neutralisation. Neutralisation. When an acid and alkali are added together they cancel each other out. This results in a neutral pH and a salt being formed. General Equation. ACID + ALKALI . SALT + WATER. Salt Formed:. Depends on:-. 1 the acid used.

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Acid / Alkali Neutralisation

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  1. Acid / Alkali Neutralisation

  2. Neutralisation • When an acid and alkali are added together they cancel each other out. • This results in a neutral pH and a salt being formed.

  3. General Equation • ACID + ALKALI SALT + WATER

  4. Salt Formed: • Depends on:- • 1 the acid used • 2  the metal in the alkali.

  5. Examples of salts formed Hydrochloric acid produces chlorides • Sulphuric acid produces • sulphates • Nitric acid produces • nitrates

  6. Example Hydrochloric acid + Sodium Hydroxide (acid) (alkali) Sodium Chloride + Water (salt)

  7. Neutralising acid with alkali Experiment • Equipment • Acid • 2 different strength alkalis • Measuring cylinder • Conical flask or beaker • Indicator

  8. Method • 1.   Add 20ml of acid to a conical flask or beaker. • 2. Add a few drops of indicator and swirl to make sure you have an even colour. • 3.   Measure 40ml of alkali in a measuring cylinder

  9. Method continued: • 4. Slowly add alkali, swirl constantly. • 6. Continue to add alkali until you think you have a colour change- then add 1 drop more. • 7. Make a note of the volume of alkali used. • 8. Repeat with the other alkali.

  10. REMEMBER: • Acids and Alkalis burn. • You must wear safety specs at all times throughout this practical. If you spill any on yourself, wash it off immediately and tell teacher a.s.a.p.

  11. Results table

  12. Conclusion and Analysis • What conclusions can we make? • How does the volume of alkali needed to neutralise the acid relate to its strength? • Was this a fair experiment? • How could we improve it?

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