Is magnesium hydroxide a strong electrolyte

Yes, strong electrolytes refer to electrolytes with an ionization degree of more than 30% under normal circumstances, such as strong acids, strong bases and most salts. For magnesium hydroxide, the part dissolved in water is completely ionized, not a reversible process


Ionic compounds and some covalent compounds with polar bonds are all ionized into ions in aqueous solution, and no molecules exist. Therefore, there is no ionization balance between molecules and ions. Such electrolytes are strong electrolytes. Strong electrolytes are all ionized into ions in aqueous solution. For example, strong acids, bases and most salts are strong electrolytes.


There is no absolute standard for the strength of electrolytes, and there is no strict boundary between the strength of electrolytes. Generally speaking, the strength of electrolyte is divided according to its ionization degree.


Because the ionization constant is related to temperature and independent of concentration, sometimes the ionization constant is used to compare the ionization ability of acid and alkali. It is generally considered that the ionization constant K (25 ℃) of an acid or base is greater than 1, which is a strong acid or base, that is, a strong electrolyte. It can be seen that there are a series of intermediate electrolytes between strong and weak electrolytes.


Some electrolytes are ionized step by step. The first step is complete ionization, while the second and third steps are incomplete ionization, which has the property of weak electrolyte. For example, the first-order ionization of sulfuric acid is almost complete, while the second-order ionization is incomplete, and the ionization constant is 1.2 × 10-2, with the characteristics of medium strong acid. However, sulfuric acid is still a strong acid because the first-order ionization constant k > 1.


Because the ionization degree of the same electrolyte in concentrated solution is small, it shows the property of weak electrolyte; In dilute solution, the ionization degree is large, which shows the property of strong electrolyte. Therefore, strong and weak electrolytes are divided according to the degree of ionization. For the same electrolyte, it may be strong electrolyte or weak electrolyte depending on the concentration. For the sake of unity, the concentration of substance is generally 0.1mol · L-1.


The same electrolyte can also show completely different properties in different solvents. For example, salt is a strong electrolyte in water, while it is a weak electrolyte in solvents with weak polarity, such as methanol. In general, the so-called strong and weak electrolytes are for aqueous solutions.


Strong electrolytes and weak electrolytes cannot be regarded as the category of substances, but only the category of electrolytes. Due to their different states, their properties are also different