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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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Tracy dissolves 2.5 grams of hydrochloric acid (HCl) into 1 liter of water. What is the pH of the solution?
  1. 1.1
  2. 1.6
  3. 1.9
  4. 2.5
  5. 3.1
Explanation
Answer: B - Hydrochloric acid is a strongly dissociating acid, so all of it will dissolve in water. 2.5 grams of HCl is 0.027 moles of acid, which will result in 0.027 moles of hydrogen ions in water. Thus, the pH is -log(0.027) = 1.59, which is approximately a pH of 1.6.
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