Identifying Five Unknown Chemicals

We obtained five unknown samples that identify five unknown chemicals, sodium chloride, sodium thiosulfate, calcium carbonate, sodium bicarbonate, sodium nitrate These samples are white and solid. However, since I do not know which kind of material is which sample, I only have information on the physical and chemical properties of these substances. In order to identify five unknown samples and to know which samples are which materials, we need to perform this experiment to find the chemical and physical properties of these samples.

Question: I have three unknown chemicals labeled A, B, C, D, E. Appropriate test to identify chemical substances. METHODS: To identify these chemicals, we run two kinds of tests. It is flame test and chemical test. Flame test: For flame testing, I soaked the wire in a roaring sound Bunsen flame. Then we dipped the wire in hydrochloric acid. Then I put it in a sample and put it in a roaring Bunsen flame. After recording the color safety of the flame, I used goggles to protect my eyes from acid (hydrochloric acid is corrosive) When I did not use the Bunsen burner, I put it in a safety flame. Small amount of acid and safe pad cat ion test: chemical flame color ion A yellow Na + B clove K + C green Cu 2+ ion test: substance test observation Sodium chloride diluted hydrochloric acid added snore and carbon dioxide gas

Identifying unknown compounds is a difficult task. When identifying compounds, researchers often measure several physical properties: observing melting point, boiling point, density, and some chemical properties: reactivity of compounds, acidity, and basicity Every time. The reason for determining the chemical and physical properties of some of the compounds is that two different compounds are likely to have some common physical and / or chemical properties. )

This experiment studies the chemical and physical properties of three unknown metals to distinguish them from nine different metals, Mg, Al, Fe, Zn, Ni, Pt, Ag, Sn, Pb . Chemical and physical properties were tested by density, sodium hydroxide, substitution and hydrochloric acid tests. The density test and the sodium hydroxide test passed, and the replacement test and the hydrochloric acid test were contradictory, so the four results coincided with each other. However, the analysis demonstrates that metal A is aluminum, metal B is zinc, and metal C is iron. Because the results are inconsistent, the final identification of the metal may be incorrect, so it will be less reliable.