Chemistry Help?

Question

In chemistry today, we did a flame test. For the lab report conclusion, there are a few questions that I do not know the answer to. If you can help with any of them, that would be greatly appreciated.

1. Explain the reason potassium was visible when using the cobalt glass.

2. Explain the effect of the nitrate ion in solution on the color emission.

3. Give at leasr two reasons why the flame test is sometimes invalid.

4. What other means of qualitative analysis are used to identify metals?

Answer 1

1.) Cobalt glass filters out the intense yellow color of sodium, allowing the delicate lilac flame of potassium to come through.

2.) First, I do not know. I don't have your lab book. Second, nitrate at high temperatures oxidizes any interfering elements.

3.) Different elements give the "same" colors. For example, both boron and copper give "green." More delicate instruments than the human eye can distinguish green from green.

4.) X-ray fluorescence. Hit the sample with an x-ray beam higher in energy than the K-shell electrons you want to excite, and the electrons will relax to ground with characteristic x-ray emission.

Atomic absorption spectroscopy. Vaporize/atomize the sample, probe the atoms with ultraviolet-visible light, and detect the wavelengths of light that are absorbed.

Atomic emission spectroscopy. Vaporize/atomize/ionize the sample in an inductively coupled plasma generator. As the electrons relax to the ground state, detect the characteristic wavelengths of light that they emit.

Answer 2

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Answer 3

4) mabality hardness and density
3) inpurties in the chemicals