Flashcards in C2e Deck (9):
What is an indicator?
-dye that changes colour depending on pH of substances
Give some examples of indicators and how they work?
-universal indicator is a combination of dyes, colour change gradually as pH changes, useful for estimating pH of solutions, add a drop of indication to a solution and compare it to a colour chart to work out pH
-some change colour suddenly at a particular pH
What is an acid?
-substance with pH less than 7
-forms H+ ions in water
-pH determined by concentration of H+ ions
What is a base?
-substance with pH greater than 7
What is an alkali?
-a base that is soluble in water
-forms OH- ions in water
What do acid and ammonia produce?
What do acids and carbonated produce?
-carbon dioxide, salt and water
What do acids and metal oxide, and acids and metal hydroxide produce?
-salt and water