Introduction to acids and alkalis S2 Chemistry Classifying chemicals and chemical reactions

Learning outcomesSuccess criteria Understand how to classify solutions according to their pH. Classify a solution as “acid”, “alkali” or “neutral” according to: The colour it turns pH paper or Universal indicator The pH number Draw a labelled pH scale, including: A continuous range of numbers from below 0 to above 14 Labels to indicate the acidic, alkaline and neutral areas Arrows to indicate increasing acidity and alkalinity The range of colours produced with Universal indicator

Learning outcomesSuccess criteria Know the pH of pure water.State the pH number of pure water. Know the names of household acids and alkalis. Given the name of a household chemical, you can classify it as acid or alkali. Know the names of common lab acids and alkalis. Name at least three common lab acids. Name at least three common lab alkalis.

Learning outcomesSuccess criteria Understand the effect of diluting an acid or alkali. State what effect dilution has on the pH of: – an acid – an alkali

Stomach acid Lemon juice Battery acid Tea Drinking water Toothpaste Bleach Cola Milk of magnesia 0

Increasing alkali Increasing acid Neutral Stomach acid Lemon juice Battery acid Tea Drinking water Toothpaste Bleach Cola Milk of magnesia

Task Make up 10 true/false questions to assess someone’s knowledge and understanding of this lesson’s learning outcomes.

Learning outcomesSuccess criteria Understand how to classify solutions according to their pH. Classify a solution as “acid”, “alkali” or “neutral” according to: The colour it turns pH paper or Universal indicator The pH number Draw a labelled pH scale, including: A continuous range of numbers from below 0 to above 14 Labels to indicate the acidic, alkaline and neutral areas Arrows to indicate increasing acidity and alkalinity The range of colours produced with Universal indicator

Learning outcomesSuccess criteria Know the pH of pure water.State the pH number of pure water. Know the names of household acids and alkalis. Given the name of a household chemical, you can classify it as acid or alkali. Know the names of common lab acids and alkalis. Name at least three common lab acids. Name at least three common lab alkalis.

Learning outcomesSuccess criteria Understand the effect of diluting an acid or alkali. State what effect dilution has on the pH of: – an acid – an alkali