how do u distinguish b/w 2 elements that appear to have the same flame test? please help!!?

Question

chem lab=worse subject and its not in my text book

Answer 1

Rely on other tests like Charcoal Cavity tests, Precipitation tests etc. if two elements give same colour of flame.
I have listed the colours obtained.
In an Ordinary lab though you will not be given two elements giving the same colour in the flame test.

Symbol Name Color
As Arsenic Blue
B Boron Bright Green
Ba Barium Light green
Ca Calcium Red-orange
Cs Caesium Pale violet
Cu(I) Copper(I) Pure Blue
Cu(II) Copper(II) (non-halide) Emerald green
Cu(II) Copper(II) (halide) Blue-green (bluish green)
In Indium Blue
Li Lithium Crimson
K Potassium Lilac
Mn(II) Manganese(II) Yellowish green
Mo Molybdenum Yellowish green
Na Sodium Intense yellow
P Phosphorus Pale bluish green
Pb Lead Pale green
Rb Rubidium Pale violet
Sb Antimony Pale green
Se Selenium Azure blue
Sr Strontium Crimson
Te Tellurium Pale green
Tl Thallium Pure green
Zn Zinc Bluish green

Answer 2

Flame tests aren't really all the accurate as the human eye cannot distinguish the 1000s of shades of each color. They are really only meant for a gen chem class and to show the differentiation between the burning of certain transition metals salts (copper burns blue and magnesium green).

This is not CSI, using an HPLC and GCMS are not as effective as they show you. GCMSs do not do all that well (depending on the stationary phase) with water or metals and HPLC is a quantification technique, requiring a calibration curve to be determined.

There is no easy way to determine this (without further testing). I suspect this is a postlab/prelab question. Adding a halide source and classifying the salt via appearance and solubility or using spectroscopic techniques such as obtaining a UV/Vis spectra (followed by a calculation of the crystal field splitting energy) or creative uses of a atomic absorption (AA) spectrometer would all be acceptable answers.

Answer 3

I was thinking about Krishna how this tied up boy is the universal form. How can a boy bound by labels of every kind have a form i discussed myself. Krishna jewels read Aura's and if i consist of aura's it becomes clear that I'm easy game i know hes using heart of stone to break inside the glass house of mirror's and I told Krishna, How can I still do anything for you when I cant , see you, feel, you, taste . What happened to the phrase be yourself. Not to worry, Its all in my plan. I know death is silent ssh but its so hard to hold on, Science and Religion are the two scales the pole which is the tree is Krishna in disguise the Ornaments are his jewels. Funny y did I not kill the tree maybe because of the pretty ornaments he has I forget about it.

Answer 4

depending on the nature of the sample used, you might be able to find it out using GCMS (gas chromatography mass spectroscopy) or HPLC (high performance liquid chromatography), these laboratory machines usually have a set of standards which can pinpoint what your sample is. good luck