1. They are if something tastes sour, if it reacts to metals or carbonates, if it turns blue litmus paper red, a pH lower than 7, and lastly if in a solution it produces hydrogen ions.
http://wiki.answers.com/Q/What_properties_distinguish_acids&alreadyAsked=1&rtitle=What_are_four_properties_of_acids&isLookUp=1
2. They taste bitter, feel slippery, can be caustic, and turn red litmus paper blue.
http://wiki.answers.com/Q/What_are_the_properties_of_bases#ixzz16botVnjO
3. If the paper turns red it must be an acid and if it turns it blue it must be a base.
4. You can tell because if the food is sour it is a acid and if it is bitter it is a base.
5. You need to wear gloves because the fertilizer will hurt your hands. Also allows you not to wash your hans so often while doing gardening.
http://wiki.answers.com/Q/Why_is_it_wise_to_wear_gloves_while_spreading_fertilizer_in_a_garden
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