The solubility of sodium chloride is 35.9 g/100 g H2O at 20°C. 35.9 g of sodium chloride are added to 100 g of water, and all of it dissolves. Another solution is made from the same amount of salt and the same amount of water. This time some solid remains undissolved.



What factor could cause the difference?



solute purity

volume

temperature

beaker size

HCl lowers the boiling point of water more than HC2H3O2 does.

termperature.

Some molecular compounds, such as HCl, ionize completely in solution. Some molecular compounds such as HC2H3O2 do not ionize completely when they dissolve in water.

Which explains their solution properties?


HCl and HC2H3O2 have the same effect on the properties of the solution.

HCl lowers the freezing point of water more than HC2H3O2 does.

HCl lowers the boiling point of water more than HC2H3O2 does.

The factor that could cause the difference in solubility is solute purity.

To understand why solute purity can affect solubility, we need to understand what solubility means. Solubility refers to the maximum amount of solute that can dissolve in a given amount of solvent at a particular temperature.

In this scenario, the solubility of sodium chloride is given as 35.9 g/100 g H2O at 20°C. This means that at 20°C, the maximum amount of sodium chloride that can dissolve in 100 g of water is 35.9 g.

When 35.9 g of sodium chloride is added to 100 g of water and all of it dissolves, it means that the solute purity is high. This implies that the sodium chloride used in this case is of high quality and does not contain any impurities that can hinder its ability to dissolve in water.

Now, when the same amount of sodium chloride (35.9 g) and the same amount of water (100 g) are used to create another solution, but this time some solid remains undissolved, it suggests that the solute purity is lower. The presence of impurities in the sodium chloride could hinder its ability to dissolve fully in water, resulting in some solid remaining undissolved.

Therefore, the factor that could cause the difference in solubility between the two solutions is the solute purity.