ACIDS & ALKALIS.

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Presentation transcript:

ACIDS & ALKALIS

Acids & Alkalis Acids and alkalis are chemical opposites We can test whether a substance is acid or alkali by using an indicator. There are different indicators including: Litmus Universal Indicator

INDICATORS Click on the test tubes to find out how LITMUS indicator works ACID ALKALI

INDICATORS blue indicator turns alkalis _______ . and acids . indicator tells us how strong or weak an acid or alkali is. Litmus red Universal

MAKING INDICATORS We can use , , And flowers to make indicators. We need to use this equipment: berries vegetables Measuring cylinders pestle mortar

The pH Scale Weak acid Weak alkali Strong acid Strong alkali Neutral 1 6 8 14 7 Strong acid Strong alkali Neutral

NEUTRALISATION ACID + ALKALI NEUTRAL +

Testing Soil pH alkaline acidic lime Soils have different pH’s. If the soil is pH 5 it will be . If it is pH 10 it will be . To make acidic soil neutral we can add . alkaline acidic lime