Which of the following substance is not an acid?

Substance A is tested and found to have a pH of 3.
Substance B, a common food, tastes sour.
Substance C causes metals to corrode.
Substance D feels slippery in solution.

Question

Which of the following substance is not an acid?

Substance A is tested and found to have a pH of 3.
Substance B, a common food, tastes sour.
Substance C causes metals to corrode.
Substance D feels slippery in solution.

photon336 · Answer

@onew12 

well, FYI an acid has a ph<6 so a substance with a pH of 3 is definitely an acid. of course they do cause metals to corrode too. 

But they do not feel slippery in solution that's actually a property of some weak bases.