25. Q Methane reacts with steam and an equilibrium is reached.
torul
CH.(g) + H2O(g) ICO(g) + 3H2(g)
2
The forward reaction is endothermic.
Which row shows how the amount of hydrogen at equilibrium changes when the pressure or
temperature is changed as indicated?
change in
temperature
change in
pressure
amount of
hydrogen
A
decrease
no change
increase
B
increase
no change
decrease
с
decrease
increase
no change
D
decrease
decrease
no change

The correct answer is b) false

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.

Qand k are only the same when the forward rate of the reaction has reached zero.