Sorry that is Incorrect
The correct answer is soap. All of the other answer choices are incorrect. Here is why:
- A lemon--> One can tell that a lemon is extremely acidic because it has a sour taste, so it cannot be basic
- Water --> Water is neutral because it contains both a H+ ion and a OH- ion. Also water is neither bitter or sour.
- Soap --> This is correct!
- Vinegar--> One can tell that vinegar is acidic because it is sour and the chemical formula for plain vinegar is CH3COOH, which as one can see definitely has at least one H+ ion.