Acids & Alkalis

• acidic solutions have pH less than 7
• alkaline solutions have pH greater than 7
• neutral substances have pH equal to 7
• pure water has a pH of 7
• What does concentrated men?

  Lots of Acid/alkali particles for the amount of water
• What does dilute mean?

  A small number of acid/alkali particles in the same amount of water
• Acids and alkalis are corrosive
• acids can be neutralised by an alkaline solution or another acid
• If you want to know if something is acidic or alkaline you need to use an indicator
• Limtus paper is a type of indicator paper that changes color when exposed to acidic solutions.
• in acid - blue paper turns pink
• in alkali - pink paper turns blue
• When an acid reacts with a metal element.or compound salt is formed
• a base is a compound that can react with an acid to make a neutral solution
• bases that are soluble in water are alkalis
• When you name salts the name of the metal comes first
• • hydrochloric acid produces metal chlorides
  • sulfuric acid produces metal sulfates
  • nitric acid produces metal nitrates