2) The pH of a sample of blood is 7.4, while gastric juice is pH 1.4. The blood sample has: A) 5.29 times lower [H ] than the gastric juice. B) 6 times lower [H ] than the gastric juice. C) 6000 times lower [H ] than the gastric juice. D) one million times lower [H ] than the gastric juice.

The blood sample has: D) one million times lower [H⁺] than the gastric juice.

Explanation:

Step 1: Calculate the concentration of H⁺ in blood

We will use the definition of pH.

pH = -log [H⁺]

[H⁺] = antilog - pH = antilog - 7.4 = 4.0 × 10⁻⁸ M

Step 2: Calculate the concentration of H⁺ in gastric juice

We will use the definition of pH.

pH = -log [H⁺]

[H⁺] = antilog - pH = antilog - 1.4 = 0.040 M

Step 3: Calculate the ratio [H⁺]gastric juice/[H⁺] blood

[H⁺]gastric juice/[H⁺] blood = 0.040 M/4.0 × 10⁻⁸ M = 1,000,000

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