if NaCl solid ionizes in H2O what happens?... therefore do you consider it as a physical or a chemical change?

Question

pleeease help me figure this out!... its really important!.... tnx..

Answer 1

There is chemistry involved, plus it changes its physical state.

The sodium ion will become a hydrate complex: 6 molecules of water will orient around it, pointing with the oxygen to the ion, and pointing away from the ion with their hydrogens.

While this is not a redox reaction or a precipitation, it does change the electron configurations of the participating molecules and ions.

You can use physical measurements to show the change in the water - different infrared absorptions for the newly formed arrangement, for instance.

Answer 2

This is a questionof symantics and not really chemistry.

What is happening is that the Sodium and Chlorine ions are dissociating in the water because their lattice energy is less than the kinetic energy of the water molecules. So the water is able to break the ions away from their electromagnetic attraction to the salt crystal.

That sort of process is usually not called a chemical change although I can certainly see some professor calling it that to emphasize that the ions in dissociation have caused the halo of electrically oriented water molecules around each ion.

With sodium ions, which are positive, you would have the lone pairs of the oxygen atoms in water pointing to the sodium ion. With Chloride ions, which are negative, you would have the hydrogen side of the bent water molecules oriented towards the chloride ions. This will change the physical, and to a minor degree, the chemical properties of the solution.

But most people would not consider it a chemical change.

Answer 3

It is a physical change as it only involves a change in physical state from the solid to the liquid state. You can theoretically obtain NaCl solid by evaporating the NaCl solution. This is a reversible reaction and is therefore a physical reaction.

Chemical changes are irreversible changes like combustion where you are unable to get back the orginal reactants.

I hope this helps.

Answer 4

When we put NaCl in water, the "NaCl molecule" breaks apart into a positive fragment(Na+) and negative fragment(Cl-), called ions, by its interaction with the solvent. this cause to increases the yield of electrisity conduction in solution. also this is not a chemical change, because we haven't new material or product, so if we vaporize the water, Na+ and Cl- ions bond and form NaCl and this is an ionic bond.

Answer 5

There is no chemical reaction, as a chemical reaction would produce a new substance that have different chemical properties as its constituent atoms or molecules. However, when NaCl dissolves in H2O its still salt and water.

Answer 6

THERE WAS NO CHEMICAL REACTION... The explanation is below...

THis is because, when NaCl was dissolved in water, Na+ and Cl- are separated because of the water molecules... HOwever, we cannot retrieve these ions because:

if we want to get Na+, we have to remove water and Cl-
and
if we want to get Cl-, we should remove water and Na+

Both are impossible to make since when you take water by heating and evaporation, the Na+ and Cl- with opposite charges attract and make NaCl again

:-)

Answer 7

its first of al a chemical change as it almost completely dissociates in Na+ and Cl- . whether its physical or not i will say yes and no. yes because it dissocaites..but no also because in the crystal structure of NaCl the Na+ and Cl- ions exists as such. so a very difficult question to answer.

Answer 8

Well a chemical reaction takes place by different properties bonding together which is the ionization process. the change is chemical

Answer 9

It forms a solution of NaCl ,it is temporary change that is Physical change.

Answer 10

Not so sure, but the dissociation of the ions and break up of lattice and formation of H bonds could be physical..look @ boiling; breaking of H bonds_V.D.W. is classified a physicl so why not dissolution. Theoretically, that's Grade 5 basics. So I dunno lol.