Question

Find the incorrect statement:

A. The pH of gastric juice can be 1.5 to 2, which indicates a [H+] of 0.0316 to 0.01 M.

B. With a pH of 5, coffee is more acidic than lemon juice, pH 3.

C. In a sample of distilled white vinegar, [H+] = 3.98 X 10–3, hence its pH is 2.4.

D. The “physiological pH” of 7.4 refers to mammalian arterial blood (plasma).

Answer 1

Ans

all the statement are true except one,

That is (B) according to statement "coffee is more acidic than lemon juice"

According, to pH scale "lesser the pH more acidic it is" where as coffee ( black coffee) has pH around 4.5 to 5 while the lemon juice has pH about 2

So, lemon juice should be more acidic then coffee

note that we are talking about black coffee because its free from milk

milk has pH 6 to 6.5 which may interfere with the acidic pH of subsequent ( coffee)

A) The pH of gastric juice can be 1.5 to 2, which indicates a [H+] of approximately o.0316 to 0.01M

White vinegar, [H+] = 3.98×10-3, hence its pH" is 2.4 ( true)

The" physiological pH of 7.4 refer to mammalian arterial blood true

For any doubt you can ask me in the comment box..