Question

A test tube contains a saturated solution of silver bromide. Which reagent, from the four below, will produce the largest amount of solid precipitate once it is added to the test tube? View Available Hint(s) A test tube contains a saturated solution of silver bromide. Which reagent, from the four below, will produce the largest amount of solid precipitate once it is added to the test tube? Concentrated HNO3 Concentrated NH3 0.2 M CaF2 Concentrated HBr

Answer 1

Concentrated
`HNO_(3)`

Step-by-step explanation:

The concentrated
`HNO_(3)` will give the larger amount of solid precipitate because is a strong acid that will react with silver, giving
`AgNO_(3)`, that is a insoluble salt. The concentrated
`NH_(3)` is a weak base, so it will not react properly with the silver bromide due to its chemical properties.
`CaF_(2)` also will not give a proper reaction because it is a salt, and salts do not react properly in aqueous solutions. And finally the concentrated HBr is not a good choice because the solution is already saturated with bromide, and the silver bromide is soluble in the solvent.

Answer 2

HBr will produce the largest amount of solid precipitate once it is added to the test tube.

Step-by-step explanation:

The reaction of silver bromide (AgBr) with the following reactans gives:

AgBr(s) + HNO₃ → AgNO₃(aq) + HBr

AgBr(s) + 2NH₃ → Ag(NH₃)₂⁺(aq) + Br⁻

2AgBr(s) + CaF₂ → 2AgF(aq) + CaBr₂

AgBr(s) + HBr no reaction

As you can see, HNO₃, NH₃ and CaF₂ react with the solid AgBr to produce soluble compounds decreasing the amount of solid precipitate. As HBr doesn't react with silver bromide, its concentration will not decrease and, for that reason, HBr will produce the largest amount of solid precipitate once it is added to the test tube.

I hope it helps!