Ineed with science which of these is a property of a bases? a they produce hydrogen gas when reacted with metals. b they turn litmus paper blue. c they feel sticky. d they taste sour. an unknown solution has a ph of 7. how would you classify this solution? a acidic b basic c neutral d there is not enough information to answer this question which of these is an acid? a vinegar b naoh c ammonia d water a high concentration of hydrogen ions means a solution is what? a very acidic b very basic c neutral d neither acidic or basic if litmus paper is dipped in acidic solution and then a basic one, what will happen? a the paper will turn from blue to red b the paper will turn from red to clear c the paper will turn from blue to clear d the solution will turn from red to blue