chemical changes Flashcards
(11 cards)
What is a solution with a PH 1-6
acid
what is the neutralisation reaction
acid + alkali = salt and water
what is a solution 8-14
alkali
what colour is neutral (7)
green
what is another method to test pH other than universal indicator
Use a pH probe and pH meter which can measure pH electronically - more accurate
what are H+ ions
hydrogen ions (from acid)
what are OH- ions
hydroxide ions (from alkali)
what is the product of H+ and OH- ions
H2O
what is the purpose of titration
to see what volume of a reactant is needed to react completely with a certain volume of another reactant
eg. how much acid is needed to react with a certain volume of alkali
what colour is phenolphthalein in acid and alkali
acid = colourless
alkali = pink
what colour is methyl orange in acid and alkali
acid = red
alakali = yellow
