No, they are simply the opposite. You can get strong acids (like hydrochloric acid – HCl) and strong alkalis (like sodium hydroxide – NaOH). It simply depends on which bit of the molecule you want to break off and use: the H in HCl and the OH in NaOH. When you combine HCl and NaOH you get NaCl (table salt) and H20 (water) and the acid / alkali is neutralised.
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