Neutralisation of acid and base using white vinegar (acid) and bicarbonate of soda (base). Write down the aim, investigative question and hypothesis for this investigation.

Here are the answers for this chemistry practical paper:

• 1 Write down the aim of this investigation. The aim of this investigation is to determine how adding white vinegar (an acid) affects the pH of a bicarbonate of soda solution (a base).

• 2 Formulate an investigative question for this investigation. How does the amount of white vinegar added affect the pH of a bicarbonate of soda solution?

• 3 Write down the hypothesis for this investigation. If white vinegar (an acid) is added to a bicarbonate of soda solution (a base), then the pH of the solution will decrease.

• 4 APPARATUS

  • Bicarbonate of soda
  • White vinegar
  • Distilled water
  • Universal indicator solution/universal indicator paper (cut into 5cm strips)
  • Dropper/syringe
  • Cavity tile/white saucers/test tubes
  • Spatula/teaspoon
  • Glass rod
  • 250 ml glass beakers

• 5 METHOD (USING UNIVERSAL INDICATOR PAPER)

  • Step 1: Prepare the universal indicator paper by neatly placing five 5cm pieces into a cavity tile/white saucer.
  • Step 2: Place one teaspoon of bicarbonate of soda in the beaker.
  • Step 3: Add approximately 10 teaspoons of distilled water to the bicarbonate of soda.