which of the following has a basic ph

Question

lemon juice
milk of magnesia
tomatoes
hydrochloric acid

Answer 1

I know three of them are acidic. The other must be basic.

What do you think?

Answer 2

lemon juice

Answer 3

Have you ever tasted lemon juice? Doesn't it pucker your mouth like vinegar?

http://en.wikipedia.org/wiki/Citric_acid

Answer 4

yes

milk of magnesia

Answer 5

Right! Milk of magnesia is the only basic on that list.