Chemistry, 05.12.2019 17:31 mooredollie

Can you make a prediction about which ionic compounds will cause an increase or decrease in the temperature of the solution when they dissolve in water?

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If the hydration energy is greater than the lattice energy of the solute, then the enthalpy of solution is positive(exothermic), otherwise it is negative(exothermic).

Explanation:

The process of dissolving can be endothermic (temperature goes down) or exothermic (temperature goes up).When water dissolves a substance, the water molecules attract and “bond” to the particles (molecules or ions) of the substance causing the particles to separate from each other.The “bond” that a water molecule makes is not a covalent or ionic bond. It is a strong attraction caused by water’s polarity. It takes energy to break the bonds between the molecules or ions of the solute.In an ionic solution, the existence of the lattice energy and hydration energy largely determines if the solution is exothermic or endothermic.

Lattice Energy: It is a measure of the cohesive forces that bind ions.

Hydration energy: is the amount of energy released when one mole of ions undergo hydration.

Energy is released when water molecules bond to the solute molecules or ions.If it takes more energy to separate the particles of the solute than is released when the water molecules bond to the particles, then the temperature goes down (endothermic) i.e hydration energy is greater than the lattice energy.If it takes less energy to separate the particles of the solute than is released when the water molecules bond to the particles, then the temperature goes up (exothermic) i.e hydration energy is less than lattice energy.

Answer from: Quest

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

Answer from: Quest

consider the reaction below.

no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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Can you make a prediction about which ionic compounds will cause an increase or decrease in the temp...

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