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Acids Bases and pH

Acids Bases and pH. Year 8 Science Mr Kos. Acids and Bases. pH pH refers to the concentration of H 3 O+ Lots of H 3 O+ means low pH (acid) Less H 3 O+ means high pH (base) Lots of indicators are available. Acids and Bases. indicators

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Acids Bases and pH

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  1. Acids Bases and pH Year 8 Science Mr Kos

  2. Acids and Bases • pH • pH refers to the concentration of H3O+ • Lots of H3O+ means low pH (acid) • Less H3O+ means high pH (base) • Lots of indicators are available

  3. Acids and Bases • indicators • React with either acid or base and provide a visible indication of acidic or basic properties • Often made from natural substances • Universal Indicator can show a variety of pH levels

  4. Acids and Bases in real life • Antacids • Taken to relieve heartburn • HCl from stomach enters oesophagus. • Antacids are taken to neutralise the stomach acid http://www.mylanta.com.au/IndigestionHeartburn

  5. Title: Antacids – Neutralising heartburn Aim: To investigate the effect of antacids on stomach acids Hypothesis: Materials: Safety glasses Heatproof mat 100ml Conical flask 0.05M Hydrochloric acid Universal indicator Antacid powder spatula Method: Pour some hydrochloric acid into flask Add 2-3 drops of universal indicator Note the colour and pH Add a spatula of antacid powder Note the colour and pH Variables: Independent Dependent Constant

  6. Discussion: What happened to the pH when the antacid was added? What causes the burning sensation in heartburn? Explain how antacids relieve heartburn. If you take antacids what will happen to the pH in your stomach? Are there any areas that you could suggest improvements? Conclusion:

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