Question

Which of the following is a base?
A. Baking soda in water, pH 11
B. Milk, pH 7.1
C. Tomato juice, pH 4.1

Answer 1

A. Baking soda in water, pH 11

Answer 2

Any value on pH scale greater than 7 is alkaline or basic and any value smaller than 7 is acidic.
pH represents the concentration of H+ ions. The acidic a solution or substance is, more is the concentration of H+ ions.

so, A is Basic
B is slightly Basic, but basic
C is acidic