There are very few strong acids in aqueous solution. In fact, only the following six are common:
Strong bases are also very rare. The most common strong bases are the alkali metal hydroxides and the alkaline earth metal hydroxides (except Be(OH)2). If you have a base that is not one of these in water, you can tentatively assume that it's a weak base.
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Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/reactions/faq/print-strong-and-weak.shtml