Effect of temperature on the solubility of salt in water.?

Answer 1

Solubility is the number of grams of the solute that will dissolve in 100 g of the solvent. Some things may dissolve in water but not in other liquids and some things may dissolve in other liquids and not in water.

Water is a polar solvent. Polar solvents are liquids whose molecules display a permanent dipole. A dipole has two oppositely charged poles (like a magnet). A molecule with a dipole is a molecule with a positive and a negative end. Ionic compounds are compounds that will split into two or more ions when placed in a liquid. Ions are particles that are positively charged (cations) or negatively charged (anions). Ionising liquids (polar liquids capable of dissolving ionic compounds) will dissolve ionic compounds well because they can pull both anions (with the positive ends of the molecules) and cations off (with the negative ends of its molecules). Salts are ionic compounds so I would expect them both to dissolve well in water.

I am going to use sodium chloride (common or table salt) in my experiment.
e.g.
NaCl + polar liquid ---> Na+ + Cl- (dissolved in polar liquid)
NaCl + H2O ---> Na+(aq) + Cl-(aq)
Table Salt + Water ---> Sodium + Chloride

So when you heat a polar liquid (water) it should dissolve a greater quantity than at room temperature (22-25 degrees C). The liquid molecules have more energy to move around and break the chemical bonds between the sodium and the chloride ions in the compound. They do that by attracting an ion by the oppositely charged end of the dipole in the molecule.

Because liquid molecules have more energy to break the chemical bonds between component particles in compounds, I would expect most compounds to dissolve better at high temperatures rather than low temperatures.

Ethanol is an organic compound and therefore is likely to be a covalent compound and unlikely to be a polar liquid. I do not expect ethanol to dissolve ionic compounds such as sodium chloride.

Most compounds should follow the general rule (a solute will dissolve better when the solvent is at a higher temperature rather than a low temperature). Sugars are not ionic compounds and therefore do not have ionic bonds. Instead they have covalent bonds. Covalent compounds may act differently to ionic compounds and therefore, the liquid molecules may need more or less energy to break the chemical bonds.

Chemicals
H2O (Water)
NaCl (Sodium chloride [Common or table salt] )
C12H22O11 (Sucrose [sometimes called table sugar] )

Answer 2

Solubility Of Salt In Water

Answer 3

Sodium Chloride Solubility In Water

Answer 4

Solubility of salt in water increases with temperature.

If you prepare a saturated solution of salt in water at, say 80 deg.C and allow it to cool, salt will crystallise as the solution cools down to room temperature. This is because the solubility of salt at 80 deg. C is higher than that at room temperature.

Answer 5

As temperature increases solubility increases because the kinetic energy and the solubility of the salt molecules increases

Answer 6

temperature does effect the solubility of any solid solute in a solution,like in the case of salt in water.the effect of temperature depends on the nature of reaction.if the reaction is an endothermic reaction,then the increase in temperature has a positive effect and the solubility increases.if it is an exothermic process,then the increase in the temperature would not favour the solubity of the solute.

Answer 7

dissolution of salt in water can be endothermic as well as exothermic , therefore solubility can increase or decrease according to the reaction but generally solubility increases with the increase in temperature.

Answer 8

Temperature increases solubility of salt in water.i.e temperature favours dissociation of ions.!!!

Answer 9

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Maybe you can bring water nearly to boil, add salt to it and make note of the response. My tiny brain can't remember if salt raises or lowers the boiling temperature. A quick review of ANY online encyclopedia should reveal this to you.

Answer 10

Solubility increases as tempreture increases