Which of the following substances has the lowest pH-value?

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Tomato

Vinegar

Washing soda

Human blood

answer is B.

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Detailed Solution

Concept- Lesser the pH-value, more is the acidity of the solution.
Tomato- Malic acid and citric acid are two kinds of acids found in tomatoes. They're both mild acids. As a result, the pH of tomatoes ranges from

.
Vinegar- Vinegar is made up of acetic acid (aqueous solution). Acetic acid is a water-soluble acid and has a pH of

.
Washing soda- Sodium carbonate is the popular name for washing soda. When washing soda is dissolved in water, it produces carbonic acid due to the carbonate present. As a result, its pH is

.
Human Blood- The pH of human blood is somewhere between

and

. It indicates that human blood is somewhat alkaline since it is more than

.
Thus, out of all the given options, vinegar has the lowest pH value.
Hence, the correct answer is 2.

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