Fill in the Blanks Acids and BasesOnline version Introduction to Acids and Bases by Akhmad Nur Ikhwan Taqwim 1 hydrochloric strong 7 hydrogen red alkali blue Another term for a " base " is a ( n ) . Bases turn litmus paper into color . HCl is known as acid . In term " pH " the " H " stands for . NaOH is an example of a base . Acids turn litmus paper into color . A neutral solution has a pH of .