Question

How can we know if a givien acid is strong or weak

is it related for a substance being soulable or insoulable

is nonmatels usually tend to form strong acids ?

is transition metals tend to form weak acids ?

give examples please

Answer 1

# The character of an acid either strong or weak can be determined by measuring its pKa value. Smallerthe value of pKa stronger is the acid. Here, it is to be noted that, Ka is the dissociation constant of the acid, defined as

where HA is an acid which gives and in solution

and

Greater the value of Ka means greater will be the dissociation of the acid HA and lower will be the value of pKa. Again greater dissociation means more concentration of in solution and higher the acidic strength.

# Solubility exclusively depends on extent of solvation of the ions produced by the substance in solution. Greater extent of solvation leads greater solubility. Solubility is not directly related to acidic strength as both weak and strong acids are greatly soluble in solution. Ex. both acetic acid (weak acid) and hydrochloric acid (strong acid) are extensively solution in water.

# No. There is no such regular trend for nonmetals to form strong acids. Ex. Some nonmetal oxides (/) are alkaline, is amphoteric, etc. are acidic and etc do not any such acidic or basic character. Moreover, the nonmetal hydrides show acidic character which may be strong () or weak ().

# Transition metal ions may act as strong as well as weak acid. (pH=2)and (pH=3) act as Lewis acid as they can accept lone pair of electrons and they are strong acids.