Question

6g of calcium chloride must be heated in

order to dissolve it in a test tube of water.

After an experiment, as a test tube of salt

solution cools, salt forms at the bottom of

the test tube

As soda is heated, the amount of Carbon

dioxide dissolved in it decreases.

Calcium Chloride is more soluble when it

is heated

It take more time stirring to dissolve salt

in 100ml than it does in 200mL of water.

More salt can be dissolved in a 250ml

beaker of water than in a 100ml beaker of

water

More sugar can be dissolved in Hot tea

than iced tea

The solubility of Sodium Chloride is

almost identical at 15, 20, 25 and 30°C

Supports conclusion

Brings into question this conclusion

Neutral observation

Answer 1

See explanation

Step-by-step explanation:

I will try to explain each point mentioned to the best of my ability.

The dissolution of calcium chloride in water is endothermic hence more solute dissolves as the temperature increases. When the solution cools, the solubility of the solid also decreases with decreasing temperature hence the solid reappears.

When soda is heated, carbon dioxide gas is evolved thereby decreasing the amount of dissolved carbon dioxide.

Let me state that increase in volume of solvent increases the amount of solute that can dissolve in it. This is why 250ml volume of solvent can dissolve more solute than 100ml of solvent.

Also, temperature is an important factor when discussing the solubility of a solute. This is why the temperature at which a certain value of solubility is quoted must be indicated. For solids, solubility increases with increase in temperature.

Lastly, the solubility of sodium chloride is independent of temperature. This is clearly seen by plotting a solubility curve.