Acids and Alkalis

• Acids and alkalis are groups of chemicals
• Acids and alkalis are mostly "irritant" or "corrosive"
• Indicators are a chemical used to show the presence of an acid or alkali depending on the colour
• A pH below 7 is an acid
• Litmus paper is an example of an indicator
• A pH above 7 is an alkaline
• A pH that is 7 is neutral
• If you put an acid on litmus paper it will turn red
• If you put an alkali on litmus paper it will turn blue
• A neutralisation reaction occurs between an acid and alkali to make water and a salt
• The formula for the reaction between a metal and an acid is: Metal + Acid → Salt + Hydrogen
• An alkali is also known as a base
• Acids are sour, while alkalis taste bitter or soapy.
• The strongest alkali has a pH of 14
• The strongest acid has a pH of 0
• Lemon is an example of an acid with a pH of 3
• Baking soda (Sodium bicarbonate) is an example of an alkali with a pH of 8