test for ions usimng NaOH Flashcards
what is the other method of testing for postive ions and what is it for?
using sodium hydroxide and testing postoive ions in a soloution formed
what else can be used and why?
all types of hydroxides because they are insolouble and can precipitate out of a soloution
breifley expalin the process of testing postive ions of soloutions
you add hydroxide (most time sodium) and add a few drops to the soloution of mystery coimpound
-then an insolouble hydroxixe is formed
-this insoluble coloured hydroxide allows us to identify which positve ions are present
what is the acronym for the posirtve ions table ?
a -aluminium 3+
zebra-zinc 2+
said -silverβ> Ag+
lets- leadβ> pb2+
chant-copperβ>cu2+
calim 2+
iron2+
iron 3+
what is the colour of the precipitste of aluminium ion
white
-dissolves in excess sodium bhdroxie
what is the colour of precipitate of zinc ion
white
-dissolves in excess sodium byrdroixse
what is the colour of the precipitate of silver and what is formed?
-brown(silver oxide)
what is the colour of the precipitate formed from the ion lead ?
white
what is the colour of the precipitate formed from the ion copper?
blue
what is the colour of the precipitate formed from the ion iron 2+
green
what is the colour of the precipitate formed from the ion iron 3+?
brown-red
what state must the precipitate formed be in?
a solid state
what is the ionic equation for the aluminium 3+ ion AND STATE THE STATE SYMBOLS?
al3+ + 3OH- β> al(OH)3
(aq) (aq) β> (s)
al(OH)3 + OH- β> Al(OH)4 , -^
(s) (aq) (aq)
what is the ionic equatiion for the zinc 2+ ion?
Zn2+ + 2OH- β> Zn(OH)2
(aq) (aq) (S)
Zn(OH)2 + OH- β> Zn(OH)3 , -
(s) (aq) (aq)
what is the ionic equiation for silver?
2Ag+ + OH- β> AgO2 + H2O
