Acids Bases And Slats Flashcards
What is the colour of phenolphthalein in acid, alkali and neutral
Acid - colourless
Alkali - pink
Neutral - colourless
What is the colour of methyl orange in acid, alkali and neutral
Acid - red
Alkali - yellow
Neutral - orange
What is the ph , colour and example of strong acids
Ph - 0-2
Colour - red
Example - car battery acid
Ph, colour and example weak alkali
Ph - 3-6
Colour - orange/yellow
Example - vinegar
Example , colour and ph of weak alkali
PH 8-11
Green - blue
Example washing up liquid
Example, colour and Ph of strong alkali
Ph - 12-14
Colour - dark blue and purple
Example sodium hydroxide
How can ph be measured by a ph meter
Dip the meter into the solution and gives more accurate result
What happens to strong acids in water
They completely ionise whereas weak acids only partially ionise
What is it determined as if lots of H+ ions are present
Strong acid
What is determined if it has less H+ ions
Weak acid
What is a base
A substance that will react with an acid producing a salt and water
What does concentrated mean
A concentrated acid contains a large number of acid particles dissolved per unit volume
What is a dilute acid
A dilute acid contains a small number of acid particles dissolved per unit volume
What is neutralisation
The reaction between an acid and an alkali producing water and salt
What is the ionic equation for neutralisation
H+ + OH- > H20
What is a salt
some or all the hydrogen ions in an acid are replaced by metal ions or ammonium ions
Observations for exothermic reactions
Test tube is hot to touch, effervescence, solid disappears , solution colour
What is the colour of copper oxide
Black
What is colour of copper carbonate
Green
What is colour of hydrated copper sulfate
Blue crystals
Colour of copper salt in solution
Blue
Test for hydrogen
Apply a lit splint and squeaky pop is heard
Test for carbon dioxide
Bubble gas through limewater, changes from colourless to milky white
Alkalis dissolve in water to form OH- ions
