What makes these compounds basic is that the conjugate base from the weak acid hydrolyzes to form a basic solution.
The difference between a basic salt and an alkali is that an alkali is the soluble hydroxide compound of an alkali metal or an alkaline earth metal.
These materials are known for their high levels of dissolution in polar solvents.
These salts are insoluble and are obtained through precipitation reactions.
'Alkaline salts' are often the major component of alkaline dishwasher detergent powders.