C5

• Acids can be neutralised by alkalis to form salt and water
• An alkali is a base that dissolves in water.
• A probe can be more reliable than an indicator because it produces a more accurate result and the colour is more subjective
• During a neutralisation reaction, the positive hydrogen ions from the acid react with the negative hydroxide ions from the alkali to form molecules of water.
• Group 1 metas react vigorously with water giving off hydrogen gas and leaving alkaline hydroxide solutions
• When metals and acid react together hydrogen gas is produced
• Metals that are less reactive than carbon can be extracted from their oxides by heating with Carbon
• Reaction of a metal with n acid is always a redox reaction
• Acid reacted with base neutralisation takes place and a salt and water are produced
• Pure water is neutral and has a PH value of 7
• Acids are substances that produce hydrogen ions when they're added to water
• Alkali is a solution that produce hydroxide ions when they're added to water
• Acidic have low pH
• Acids that ionise completely is aqueous solutions are known as strong acids
• Weak acids react more slowly than strong acids