How much water needs to be added to 1 mL of an HCl solution with a pH of 2 to obtain a solution with a pH of 4?
A) 1 mL
B) 49 mL
C) 24 mL
D) 2 mL
E) 99 mL
IMAT 2024 · Question 46
Q46 - The pH scale
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The correct answer is E) 99 mL.
From pH 2 to pH 4, [H⁺] goes from 10⁻² to 10⁻⁴, so the solution has to be 100 times more dilute.
1 mL has to become 100 mL, so you add 99 mL of water.
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