Best answer The enthalpy of solution of NaCl
Sodium chloride
Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g/mol respectively, 100 g of NaCl contains 39.34 g Na and 60.66 g Cl. Sodium chloride is the salt most r…
Chloride
The chloride ion is the anion Cl⁻. It is formed when the element chlorine gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents. Chloride salts such as sodium chloride are often very soluble in water. It is an essential electrolyte located in all body fluids responsible for maintaining acid/base balance, transmitting nerve impulses and reg…
Is dissolution of NaCl in water endothermic or exothermic?
Though dissolution of NaCl in water is an endothermic reaction, it is soluble in water. Explain. The enthalpy of solution of NaCl in water (that is energy change associated with the dissolution of sodium chloride crystals in water) at standard condition is very slightly positive, it is an endothermic process.
What happens when NaCl dissolves in water without added energy?
When NaCl (table salt) dissolves in water, the reaction is endothermic. Yet, when added to water, it dissolves easily (spontaneously) without added energy. How can this be? - Quora Financial loophole lets you save extra for retirement. The average account holder who uses this as an investment option has a balance of $15,092.
What is the enthalpy of solution of NaCl in water?
The enthalpy of solution of NaCl in water (that is energy change associated with the dissolution of sodium chloride crystals in water) at standard condition is very slightly positive, it is an endothermic process.
Is the bond breaking energy of NaCl greater than the ion-dipole energy?
However, for NaCl the energy of the bond breaking is greater than the ion-dipole energy; the temperature of the solution will drop [more energy for bond breaking is taken from the surroundings (the water), than it goes back from the bond formation]. Note: by the surroundings I mean here water in an isolated container.
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Why is NaCl dissolving in water endothermic?
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.
Is the reaction of NaCl endothermic or exothermic?
exothermic reactionWhen 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.
What will happen when NaCl dissolved in water?
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
Is dissolving salt endothermic or exothermic?
endothermicHence, dissolving table salt in water is endothermic. Note:There is only a type of chemical process that is either exothermic or endothermic, that is, dissolving of salts in water.
Why is NaCl an exothermic reaction?
The quick answer is that the resulting ionic compound is more stable than the ions that formed it. The extra energy from the ions is released as heat when ionic bonds form. When more heat is released from a reaction than is needed for it to happen, the reaction is exothermic.
What happens when NaCl is dissolved in water quizlet?
The sodium chloride crystal dissolves as its sodium and chlorine ions are pulled into the solution, one by one, by the surrounding water molecules. The charged ends of the water molecules surround the oppositely charged ends of the sodium chloride ions.
Which type of change is dissolving salt in water?
Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed. Physical changes can often be reversed.
When NaCl is dissolved in water which type of forces are present?
When sodium chloride dissolves in water, the sodium and chloride ions and the polar water molecules are strongly attracted to one another by ion-dipole interactions. The solvent molecules (water in this case) surround the ions removing them from the crystal and forming the solution.
How do you know if a reaction is endothermic or exothermic?
There are two methods for distinguishing between exothermic and endothermic reactions. When energy is released in an exothermic reaction, the temperature of the reaction mixture increases. When energy is absorbed in an endothermic reaction, the temperature decreases.
Why is sodium chloride endothermic?
For your chemical reaction that represents the dissolution of salt, we write, NaCl(s)⇌Na+(aq)+Cl−(aq) . The process, is indeed slightly endothermic, in that we have to input energy to break the strong electrostatic bonds that persist between positive and negative ions throughout the entire ionic lattice.
How do you know if its exothermic or endothermic?
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”
How do you tell if a reaction is exothermic or endothermic from an equation?
So if the sum of the enthalpies of the reactants is greater than the products, the reaction will be exothermic. If the products side has a larger enthalpy, the reaction is endothermic.
What does it mean when the enthalpy of NaCl is positive?
A positive enthalpy change indicates that the system acquires heat from the surrounding in order for the reaction ( dissolution) to proceed forward. When something dissolves in water, some of these O−H bonds are broken. this requires heat energy. Entropy increases when a solute dissolves in a solvent. Also if H positive G will be negative and the process is spontaneous.
When something dissolves in water, some of these O-H bonds are broken?
When something dissolves in water, some of these O−H bonds are broken. this requires heat energy. Entropy increases when a solute dissolves in a solvent. Also if H positive G will be negative and the process is spontaneous.