Question

Answer the lab question “How can you use flame color to identify the metal ion in an unknown compound?” by filling in the boxes below to create a hypothesis.
if..........
then...………
because...……….

Answer 1

If: the flame color of an unknown metal matches that of a known metal ion

Then: the metal ion likely is the same

Because: metal ions produce characteristic colors when burned.

Answer 2

We have to know how flame colour can be used to identify the metal ion in an unknown compound.

If golden yellow coloured flame , then Na⁺ ion because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.

If violet coloured flame , then K⁺ because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.

If crimson red coloured flame , then Sr²⁺ because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.

If yellowish green coloured flame , then Ba²⁺ because electrons get excited on heating and again fall back to emit energy of definite wavelengths corresponding to particular colour in the visible region.