an unknown substance turns methyl orange solution red. this shows that the substance\nis a base.\nis…

Brief Explanations:

Methyl orange is an indicator. It turns red in acidic solutions and yellow in basic solutions. Water is neutral and does not change methyl - orange color. Alkaloids are a class of nitrogen - containing organic compounds and do not have this characteristic color - changing effect on methyl orange.

Answer:

is an acid.