1.If its molar solubility is designated by “x”, then which of the following expressions best represents the solubility product for the substance Ag2SO4?
a) x2 b) 27x4 c) 4x3 d) 108x5 e) 3x4
2. Consider the equilibrium, 4HCl(g) + O2(g) 2H2O(g) + 2Cl2(g).
The equilibrium law expression for the balanced chemical equation would be:
a) [HCl][O2] / [H2O][Cl2]
b) [H2O]2[Cl]2 / [HCl]4[O2]
c) 2[H2O][Cl2] / 4[HCl][O2]
d) [HCl]4[O2] / [H2O]2[Cl2]2
e) [H2O][Cl2] / [HCl][O2]
3. 64 grams of KOH crystals are placed in 150 mL of distilled water in a sealed container. After 2 days a few crystals are still visible. The condition this system is in is best described as which of the following?
a) still reacting with the water
b) at maximum enthalpy
c) saturated
d) at equilibrium
e) supersaturated
1. Ag2SO4 ==> 2Ag^+ + SO4^2-
.....x.........2x......x
Ksp = (Ag^+)^2(SO4^2-)
Ksp = (2x)^2(x) = ??
2. Keq = (products)/(reactants) and raise each substance to the exponent that the substance has as a coefficient in the balanced equation.
I don't know the answer. I don't know the solubility of KOH at the conditions in the problem. It could be a and it just needs more time to dissolve; it could be c ( saturated). Letting it say another two-three days would help you decide OR it could be at equilibrium (time would help you decide).
1. To find the expression that represents the solubility product for the substance Ag2SO4, we need to understand what the solubility product is. The solubility product (Ksp) is a measure of the equilibrium concentration of ions in a saturated solution of a compound.
For the compound Ag2SO4, it dissociates into 2 Ag+ ions and 1 SO42- ion. The molar solubility is given as "x", which represents the concentration of Ag+ or SO42- ions in the solution.
The solubility product expression is obtained by multiplying the concentrations of the individual ions raised to their stoichiometric coefficients. In this case, it would be [Ag+]^2 * [SO42-].
Since the molar solubility of Ag2SO4 is designated as "x", the correct expression would be (x)^2, which corresponds to option a) x^2.
2. To determine the equilibrium law expression for the given balanced chemical equation, we need to understand the stoichiometric coefficients of the balanced equation.
From the equation, we can see that:
4HCl(g) + O2(g) -> 2H2O(g) + 2Cl2(g)
The stoichiometric coefficients indicate that for every 4 moles of HCl and O2, we get 2 moles of H2O and 2 moles of Cl2.
Based on this, the equilibrium law expression is determined by taking the product of the concentrations of the products divided by the product of the concentrations of the reactants, each raised to the power of their stoichiometric coefficient.
From the balanced equation, the correct equilibrium law expression would be [H2O]^2 * [Cl2]^2 / [HCl]^4 * [O2], which corresponds to option b) [H2O]2[Cl]2 / [HCl]4[O2].
3. To determine the condition this system is in, we need to understand the terms used: still reacting, maximum enthalpy, saturated, equilibrium, and supersaturated.
- If the system is "still reacting with the water," it means that the reaction is ongoing, and the reactants are being converted into products.
- "Maximum enthalpy" is the point where the system has the highest heat content.
- If a solution is "saturated," it means that it contains the maximum amount of solute that can dissolve at a given temperature and pressure, and no more solute can dissolve.
- "At equilibrium" means that the forward and reverse reactions are occurring at the same rate, and the concentrations of reactants and products do not change over time.
- "Supersaturated" refers to a solution that contains more solute than it theoretically can at a given temperature. It is unstable and can result from cooling a solution with a higher solute concentration.
In this case, 64 grams of KOH is placed in 150 mL of water, and after 2 days, a few crystals are still visible. This indicates that the KOH has not completely dissolved, but some of it is present as undissolved crystals.
Based on this information, the system is best described as "saturated," which corresponds to option c) saturated.