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KS 3 laboratory Indicators De Lisle Catholic Science College Science department.

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Presentation on theme: "KS 3 laboratory Indicators De Lisle Catholic Science College Science department."— Presentation transcript:

1 KS 3 laboratory Indicators De Lisle Catholic Science College Science department

2 Litmus indicatorRed cabbage indicator Universal indicatorLitmus indicator problem Virtual laboratory: Indicators menu

3 Litmus colour changes Acids turn: – blue litmus red Alkalis turn: – red litmus blue blue litmus paper red litmus paper Add to acid Add to alkali

4 Red cabbage indicator Acids turn: – purple RC red Alkalis turn: – purple RC green purple RC paper Add to acid Add to alkali

5 Universal indicator Acids turn universal indicator: yellow, orange or red Neutral solutions turn universal indicator:green Alkalis turn universal indicator: blue/green, blue or purple

6 Universal indicator advantages universal indicator can indicate the strengths of acids and alkali solutions –i.e. it can indicate pH values

7 Colour changes with universal indicator pH7 pH1 pH14 NeutralAcidAlkali Add universal indicator

8 Type of liquidUI colourpH value Strong acid Medium acid Weak acid Neutral Weak alkali Medium alkali Strong alkali Red Yellow Orange Green Blue/green Blue Purple

9 Litmus paper problem Liquid ALiquid B neutral (pH 7) weak acid (pH 6) What can we infer from the observations? Add universal indicator to both liquids Add a piece of blue litmus paper to both liquids

10 KS 3 laboratory De Lisle Catholic Science College Exit Thank you for your visit to our virtual laboratory


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