2.1.3 Determination Of Formulae Flashcards
What’s the empirical formula
Simplest whole number ratio of atoms of each element in a compound
What’s molecular formula
Actual number if atoms of each element in 1 molecule
3 steps to work out empirical formula
Get the amount
Divide by Ar
Divide by smallest answer
What do you need to know to work out the molecular formula from the empirical formula
Mr
What do some salts incorporate into their crystal structure when they are crystallised from aqueous solution
Water molecules
Why can water molecules not flow like a liquid
They are bonded ‘frozen’ in space
What does water of crystallisation refer to
The immobile water molecules within the crystal structure
What does water of crystallisation and ionic salt make up
The hydrated form of salt
What will happen to water of crystallisation if the hydrated salt is heated strongly
It will often be driven off as vapour, leaving the anhydrous salt (decreased mass)
