Q: A sample of human blood has a pH of 7.4. Based on the image, which of the following best approximates the hydrogen ion concentration $$[H^+]$$?

$$[H^+] \approx 4 \times 10$$^{-8}$$

Q: Which equation correctly relates pH and hydrogen ion concentration?

$$\text{pH} = -\log_{10} [H^+]$$

Question 1

Which of the following best describes the relationship between pH and hydrogen ion concentration $$[H^+] as $$shown in the image?

Accepted Answer

As pH increases, $$[H^+]$$ decreases exponentially.

Question 2

If a solution has a pH of 4, what is the hydrogen ion concentration $$[H^+] in $$moles/liter?

Accepted Answer

$$[H^+] = 10$$^{-4}$$

Question 3

A sample of human blood has a pH of 7.4. Based on the image, which of the following best approximates the hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$[H^+] \approx 4 	imes 10$$^{-8}$$

Question 4

If the pH of a solution changes from 6 to 4, how does the hydrogen ion concentration change?

Accepted Answer

It increases by 100 times.

Question 5

Which of the following solutions is most acidic based on the pH scale in the image?

Accepted Answer

A solution with pH 2

Question 6

A cleaning product has a hydrogen ion concentration of $$[H^+] = 10$$^{-12}$$ moles/liter. What is its pH?

Accepted Answer

pH = 12

Question 7

If a solution has a pH of 3 and another has a pH of 6, how many times greater is the hydrogen ion concentration in the first solution compared to the second?

Accepted Answer

1,000 times greater

Question 8

Which equation correctly relates pH and hydrogen ion concentration?

Accepted Answer

$$	ext{pH} = -\log_{10} [H^+]$$

Question 9

A solution with $$[H^+] = 10$$^{-9}$$ moles/liter is considered:

Accepted Answer

Basic

Question 10

If the pH of a solution is 7, what can you infer about the solution?

Accepted Answer

It is neutral.

The Scientific Method and the Chemistry of Living Things

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