Neutralisation and the pH scale

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Presentation transcript:

Neutralisation and the pH scale Baseline (Flightpath D): Safely use universal indicator to classify a solution as acidic or alkaline. Describe the pH scale. Recall an example of an alkaline, neutral, basic, and acidic chemical. Further (Flightpath C&B): Describe how universal indicator can be used to classify a chemical as acidic or alkaline. Describe how solutions can be acidic or alkaline. Describe the relationship between alkalis and bases. Challenge Flightpath A): Evaluate how universal indicator or a data logger can be used to determine the approximate pH of a solution. Use ionic equations to explain how solutions can be acidic or alkaline. Explain how the pH of a solution changes as acid or alkali is added.

pH Curve Fill a burette to 0cm3 with hydrochloric acid and using a burette clamp, hold in place over a 100cm3 beaker. Measure 20cm3 sodium hydroxide and add to beaker Measure the pH using a pH probe. Add 1cm3 hydrochloric acid from the burette. Swirl the mixture, measure and record the pH Repeat with additions of 1cm3 hydrochloric acid until 25cm3 acid has been added.