Objective 3

1.  The four properties of acids are they are sour, corrosive to metals and skin, PH of 7 and a POH of 7, turns blue limus paper red, contains H
http://wiki.answers.com/Q/What_are_five_properties_of_acids_and_bases#ixzz170XwAOHw

2.  The four properties of bases are they are bitter, slippery and soapy, PH of >7 and a POH of <7, turns red litmus paper blue, and they have hydroxide 
http://wiki.answers.com/Q/What_are_five_properties_of_acids_and_bases#ixzz170ZYOrP2

3.  The litmus paper turns red if it's and acid and turns blue if it is a base

4.  If it shows one of the signs or properties in answer 1

5.  The fertilizer can hurt your hands if it gets under your skin and will burn and itch