Identify an unknown metal
In order to identify an unknown metal, people added it into hot and concentrated nitric acid ( ) solution. After all the reactions have stopped, is added into the mixture.
After all chemical reactions have stopped, there is a white precipitate in the solution.
Using all the information above, identify the unknown metal.
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1 solution
A u can't react with H N O X 3 alone.
Examining the others, we can see that the product must contain the corresponding nitric salt of each metal (which is soluble in water).
Then the nitric salt will react with N a C l , which is another salt. Two salts, which both are soluble in water, reacting with each other must create a precipitate as their product. The precipitate, which must be a kind of salt, must have been the chloride salt of the unknown metal. (Because N a N O X 3 is soluble in water)
According to the answer choices, the only metal whose chloride salt is insoluble in water and white is A g
Therefore, the unknown metal is A g
The chemical reactions happened:
A g + 2 H N O X 3 (concentrated) → t o A g N O 3 + N O 2 + H 2 O
A g N O X 3 + N a C l A g C l + N a N O X 3