Question

why doesn't vinegar change blue litmus to red

Answer 1

Because Vinegar contains Acetic Acid

Answer 2

Base: A Base is the opposite of an acid. Acids donate hydronium ions, taste bitter, and are corrosive.
This data can be found from PDF 19.



pH ,,Scale: Non-linear scale used to tell the alkalinity or acidity of a substance. Substances with a pH level of 7 are neutral. Ones with a pH level below 7 are acidic. Ones with a pH above 7 are basic. pH stands for "potential of Hydrogen" because an acid's strength is based on its ability to release Hydronium ions. It is also very good with chicken noodle soup.