Which of the following is a base? baking soda in water, ph 11 milk, ph 7.1 tomato juice, ph 4.1

Baking soda in water, pH=11

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxide ion concentration.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

Thus baking soda in water, pH=11 is basic in nature.

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