Some of the factors that have or can have an impact on the solubility constant include, the common-ion effect which is the presence of a common ion which can lead to lowering solubility and hence lowering the value of the solubility product. Another factor is the diverse-ion effect in which if the ions in the solutes are uncommon, then the value of the solubility product is high. Another factor that plays a role in affecting the value of solubility products is the presence of ion pairs.