NH3 has a solubility of 60g at 180C in 100.0mLof water.

KNO3 has a solubility of 60g at 380C in 100.0mLof water.

HCl has a solubility of 60g at 480C in 100.0mLof water.

NH4Cl has a solubility of 60g at 66oC in 100.0g water.

KClO3 has a solubility of 60g at 100oC in 100.0g water.

NH3 has a solubility of 60g at 180C in 100.0mLof water.

KNO3 has a solubility of 60g at 380C in 100.0mLof water.

HCl has a solubility of 60g at 480C in 100.0mLof water.

NH4Cl has a solubility of 60g at 66oC in 100.0g water.

KClO3 has a solubility of 60g at 100oC in 100.0g water.

The solubility of NaNO3 at 27oC is about 94g in 100mL of water.

The solubility of NaNO3 at 520C is 120g in 100mL of water.

As you see from the graph the solubility of NaNO3

INCREASES as temperature INCREASES. This is due to the fact that the dissolving of this salt is ENDOTHERMIC, energy absorbing, q is +.

At 10oC NH3 has a solubility of 70 grams of NH3 in 100 grams of water.

At 70oC NH3 has a solubility of 19 grams of NH3 in 100 grams of water.

The solubility of NH3 DECREASES as the temperature INCREASES, Therefore the dissolving of ammonia is EXOTHERMIC – it cannot give off heat at higher temperatures which hinders dissolving. The heat transfer is negative (-q) for this reaction. This is typical of gasses which dissolve poorly at higher temps.

U DO IT NOW1/29/07

1. What will occur if NaNO3 is cooled from 52oC to 27oC?

2. Which is the most soluble substance at 37oC, which is the least soluble.

3. Identify the gases in the table.

4. What will occur as the temp. of NH3(aq) in solution is increased from 10oC to 70oC?

The solubility of NaNO3 at 27oC HOLDS about 94g in 100mL of water.

The solubility of NaNO3 at 520C HOLDS 120g in 100mL of water.

As the temperature drops from 52oC to 27oC the solubility drops from 120g to 94g. The difference of 26g will precipitate out as a solid on the bottom of the vessel. The 120g that is saturated at 52oC is supersaturated at 27oC. At 27oC only 94 g can dissolve, 26g of the 120g must precipitate to reach 94g.

(520C,120g)(270C, 94g)

At 52oC 120g of NaNO3 will dissolve, the solution has 120g in 100g water.

The electrostatic attractions to begin to form the ionic crystal lattice. COOLING A

precipitate forms.

Energy is needed to break the electrostatic attractions of the lattice, (lattice energy)

The solution that could carry 120g at 52oC cannot hold that much at lower tamps precipitate will form as it cools.

COOLINGCAUSES