Nitrous acid (HNO2) is an essentially nonvolatile acid that ionizes in water with an equilibrium constant of 4 x 10-4 mol/liter. Assume that 10 mmol of nitrous acid are added to a liter of water that is open to the atmosphere. a. List all chemical species that you expect to occur in the water. For which of these do you know the concentration a priori? (you may assume the water has reached equilibrium with the air, and therefore H2CO3* concentration is approximately 12 mM, per Henry’s law) b. Write every equation that constrains the composition of the system at equilibrium identifying each as a mass conservation, mass action, or electroneutrality constraint.

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Chapter1: Chemical Foundations
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Nitrous acid (HNO2) is an essentially nonvolatile acid that ionizes in water with
an equilibrium constant of 4 x 10-4 mol/liter. Assume that 10 mmol of nitrous acid are
added to a liter of water that is open to the atmosphere.
a. List all chemical species that you expect to occur in the water. For which of these
do you know the concentration a priori? (you may assume the water has reached
equilibrium with the air, and therefore H2CO3* concentration is approximately 12
mM, per Henry’s law)
b. Write every equation that constrains the composition of the system at equilibrium
identifying each as a mass conservation, mass action, or electroneutrality
constraint. 

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