Table of Contents
- 1 Why is NaCl dissolving in water endothermic?
- 2 Why is bacl2 endothermic?
- 3 Why does NaCl dissolve spontaneously even though it is an endothermic process?
- 4 Why is dissolution endothermic?
- 5 Why is barium chloride soluble in water?
- 6 Why is barium chloride BaCl2?
- 7 Why is dissolving endothermic?
- 8 Why do endothermic reactions dissolve?
Why is NaCl dissolving in water endothermic?
Dissolution of sodium chloride (table salt) in water is endothermic. This is because more energy is released upon formation of solute-solvent bonds than was required to break apart the hydrogen bonds in water, as well as the ionic bonds in KOH.
Why is bacl2 endothermic?
The standard enthalpy change (ΔH∘ Δ H ∘ ) for the dissociation of barium chloride is the difference between the energy of solid barium chloride and the energy of the aqueous ions. The ions have more energy than the solid, so the dissociation of solid barium chloride is endothermic.
Why does NaCl dissolve spontaneously even though it is an endothermic process?
The solution of NaCl in water has much less order than the pure water and the crystalline salt. Entropy increases every time a solute dissolves in a solvent. Even though the enthalpy change is a positive number, the dissolution is spontaneous because the Gibbs free energy change, G, is negative due to the entropy term.
Is making NaCl endothermic or exothermic?
When NaCl forms, what really happens is that Na+ and Cl− come together and form an ionic bond and thus NaCl is formed and it is a quite exothermic reaction.
Why is dissolving salts sometimes an endothermic process and sometimes an exothermic process?
It takes just slightly more energy to separate the ions from one another than is released from the water molecules surrounding the ions. This means just slightly more energy must be put into the solution than is released back into the solution; therefore dissolving table salt in water is endothermic.
Why is dissolution endothermic?
The process of dissolving is endothermic when less energy is released when water molecules “bond” to the solute than is used to pull the solute apart. Because less energy is released than is used, the molecules of the solution move more slowly, making the temperature decrease.
Why is barium chloride soluble in water?
It is one of the most common water-soluble salts of barium. Like most other barium salts, it is white, toxic, and imparts a yellow-green coloration to a flame….Barium chloride.
| Names | |
|---|---|
| Boiling point | 1,560 °C (2,840 °F; 1,830 K) |
| Solubility in water | 31.2 g/100 mL (0 °C) 35.8 g/100 mL (20 °C) 59.4 g/100 mL (100 °C) |
Why is barium chloride BaCl2?
Barium chloride molecules feature an ionic bond between barium cations and chloride anions. Barium is a metal that exhibits an oxidation state of +2 in this ionic salt whereas chlorine is a non-metal which exhibits an oxidation state of -1 in BaCl2.
Why does NaCl dissolve?
When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules. Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together.
What is the factor that is responsible for salts like NaCl to dissolve in water easily decrease in entropy increase in entropy increase in enthalpy decrease in enthalpy?
Explanation: As a salt such as NaCl dissolves, the Na+ and Cl– ions leaves the crystal lattice resulting in an increase in entropy(randomness) of the system which is largely responsible for the ease of dissolving salts such as NaCl in water.