cation tests Flashcards
what are cations
positive ions
what cations use the flame test
lithium, sodium, potassium, calcium, copper
how do u carry out a flame test
clean nichrome wire with HCl, dip wire into sample, hold wire in non-luminous flame, record and observe the colour flame
result of lithium flame test
red flame
result of sodium flame test
yellow/orange flame
result of potassium flame test
lilac flame
result of calcium flame test
brick red/orange flame
results of copper flame test
blue/green flame
what cations use sodium hydroxide tests
iron (II), iron (III), copper
how do u carry out a sodium hydroxide test
dissolve sample in water, add sodium hydroxide, observe colour of precipitate
result of iron (II) NaOH
green precipitate
result of iron (III) NaOH test
brown precipitate
results of copper NaOH test
blue precipitate
how to test for ammonia
dissolve sample in water, add NaOH and water, test for ammonia
