Sample Problem 4.2
Determining the Molarity of H+ Ions in Aqueous Solutions of Acids
PROBLEM:
Nitric acid is a major chemical in the fertilizer and explosives industries. In aqueous solution, each molecule dissociates and the H becomes a solvated H+ ion. What is the molarity of H+(aq) in 1.4 M nitric acid?
PLAN:
SOLUTION:
Use a balanced chemical equation and the definition of molarity (moles/liter) to find the answer.
The nitrate polyatomic ion is NO3-. Nitric acid is HNO3.
1.4 M HNO3(aq) contains 1.4 mole of H+(aq)/L and is therefore 1.4 M in H+(aq)
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