Below is a chemical reaction in which two aqueous solutions are combined: 3 (NH4

Question

Below is a chemical reaction in which two aqueous solutions are combined: 3 (NH4)2S(????) + 2 H3PO4(????) ? 2 (NH4)3PO4(????) + 3 H2S(??)

a) What does the subscript (g) mean?

b) For any chemical equation that takes place in a liquid solution, if there’s a product with (g) next to it, what do you expect to see in the solution?

c) Look up the physical properties of hydrogen sulfide. What are two ways you might be able to tell if you generated hydrogen sulfide?

d) What is the name for this type of reaction?

Explanation / Answer

a) the subscript indicates the phase of the chemical. So (g) means that the chemical exists in its gas phase.

b)If the product is in gas phase then once can expect the formation of foam or bubbles in a liquid solution as gas phase will interact with the liquid phase.

c) Hydrogen sulfide has a signature smell of rotten egg. Also its corrosive in nature and colorless.

d) It is an example of double displacement reaction. As the negative ion and positive ion of the two reactants are switching its places.

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