I know oranges and pineapples do........O! lemons, limes, and grapefruits also have them.
If a substance changes the color of a blue litmus paper to red, it is acidic blue to red
Depends on the paper. All litmus paper is designed to work on different pH ranges. however, most liquid acids used turn blue litmus paper pink. Acid won't affect red litmus. Bases, however, turn red litmus paper blue, and does not affect blue litmus.
No, it is not possible to convert sulfuric acid to nitrous acid.
Yes, vinegar is acidic. It is composed of about 5-9 % acetic acid --> CH3COOH and is classed as weak (not highly dissosciated ) but is quite corrosive. Vinegar is the common name for acetic acid.
and its chemical formula is CH3COOH Vinegar is acidic, yes. It contains dilute acetic acid.