Anything over 7 on the pH scale are BASES. Most cleaning products are bases like bleach. Potentialy harmful ones are caustic soda. Bases react with acids to neutralize them. A base disolved in water is called an alkalis. Diluted alkalis are useful as cleaning products as oily, fatty grime is mildly acidic.
Bases
Metal Carbonate + acid= water+salt
Metal Bicarbonate + acid = Water+salt
Metal Oxide + acid = water + salt + carbon dioxide
Metal Hyrdoxide+ acid = water+ salt + carbon dioxide
Pure Metal + acid = hydrogen+ salt
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