Why does the solubility of sulphates of Group 2 decrease down the group?

Lattice energy as well as hydration energy values decrease with an increase in the size of ions and increases with an increase in charge of ions. It is because the hydration energy decreases down the group, the solubility of sulphates is also decreased down the group.

Which Group 2 element is most soluble?

Solubility trends depend on the compound anion

What is trend of solubility?

For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.

Why does solubility increase down a group?

On going down the group, the size of the cation increases and the salt becomes more ionic in nature. So, the solubility also increases down the group. This is due to the decrease in lattice energy of the hydroxide salt(in case of hydroxides) and the size of the cation increases down the group.

Why does reactivity increase down Group 2?

As you progress down Group 2, the reactivity increases. This is due to a decrease in ionisation energy as you progress down the group. As it requires less energy to form the ions, the reactivity increases.

Why does thermal stability increase down Group 2?

The thermal stability increases as you go down Group 2. This is because the Group 2 ion has lower charge density, and thus distorts the carbonate ion less. The less distorted the carbonate ion is, the more stable it is, and so a higher temperature is required to decompose the carbonate.

What do group 2 elements have in common?

The property that is common to all group 2 elements is that they tend to form ionic bonds by losing electrons making these atoms positive charge. They are called cations. These elements are beryllium, magnesium, calcium, strontium, and radium.

Why do group 2 metals increase in reactivity?

The first electron to react will be on the outer shell. The reactivity increases down the group from Mg to Ba. This is because the further away an electron is from the nucleus, the weaker its attraction and the more likely it is to react with another atom.

What is the trend of solubility in Group 1?

Solubility of the carbonates increases as you go down Group 1. Solubility of the hydroxides increases as you go down Group 1. In Group 2, the most soluble one is barium hydroxide – and it is only possible to make a solution of concentration around 3.9 g per 100 g of water at the same temperature.

How does solubility increase on the periodic table?

Water molecules are more attracted to a cation with a high charge density (i.e., a smaller atom) than one that is larger with a lower charge density. Therefore, as one moves down a family of elements in the periodic table, the charge density will decrease as will the solubility.

What is the trend of reactivity in Group 2?

The reactivity of the group 2 elements increase as you go down the group. This is because, as explained previously, it is much easier to remove an outer shell electron as you go further down the group (lower ionisation energies).

What is the trend in reactivity of Group 2 elements with water?

The overall trend, for the reactivity of Group 2 metals with water, is an increase down the group. The outer electrons are easier to remove as they are further from the nucleus and there is more shielding resulting in a lower nuclear attraction.

What are the solubility of the Group 2 elements?

This page looks at the solubility in water of the hydroxides, sulfates and carbonates of the Group 2 elements – beryllium, magnesium, calcium, strontium and barium. Although it describes the trends, there isn’t any attempt to explain them on this page – for reasons discussed later.

Why does the solubility of Group 2 hydroxides increase?

The higher the concentration of OH – ions formed, the more alkaline the solution The alkalinity of the formed solution can therefore be explained by the solubility of the Group 2 hydroxides Going down the group, the solubility of these hydroxides increases This means that the concentration of OH – ions increases, increasing the pH of the solution

How is the solubility of magnesium hydroxide determined?

It is measured in either, grams or moles per 100g of water. The trends of solubility for hydroxides and sulfates are as follows: Magnesium hydroxide (Mg (OH) 2) is said to be sparingly soluble because it does not dissolve in very well and Be (OH) 2 and BaSO 4 are insoluble.

Why does electronegativity decrease in Group 2 compounds?

For similar reasons the electronegativity decreases. The reactions of the elements with water become more vigorous down the group. When they do react they produce hydroxides and hydrogen.