In this chapter you will be able to:

• Give examples of acids and alkalis
• Describe the properties of acids and alkalis
• Describe safety and hazard warning symbol
• Explain the function of indicators
• Determine acids and alkalis using litmus
• Define universal indicator
• Describe acids and alkalis in terms of pH scale and Universal Indicator
• Determine the pH scale by colour of Universal Indicator, vice versa
• Determine the type of substance
• Describe neutralisation process
• Describe effect of addition of acids and alkalis on colour of Universal Indicator
• Describe acids production in our stomach
• Describe teeth decaying process
• Describe the effect of acids to environment
• Define variable
• Describe a good investigation questions
• Determine the most effective neutralising an acid from experiment