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AP Chemistry 8.1 A Calculate the Values of Ph and Poh Based on Kw and the Concentration of All Species Present in a Neutral Questions

Practice AP Chemistry questions on identifying pH measurement methods and relating hydronium, hydroxide, pH, pOH, and neutral water.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Explain how intermolecular forces and particle motion determine physical properties of substances.
  • Apply molecular models to predict phase behavior, boiling point and solubility from particle interactions.

AP Chemistry 8.1 A Calculate the Values of Ph and Poh Based on Kw and the Concentration of All Species Present in a Neutral Questions question 1

[Maximum number: 1]

A student is given 50.0 mL of a solution of Na2CO3\mathrm{Na}_{2} \mathrm{CO}_{3} of unknown concentration. To determine the concentration of the solution, the student mixes the solution with excess 1.0MCa(NO3)2(aq)1.0 M \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(a q), causing a precipitate to form. The balanced equation for the reaction is shown below.

Na2CO3(aq)+Ca(NO3)2(aq)→2NaNO3(aq)+CaCO3(s)\mathrm{Na}_{2} \mathrm{CO}_{3}(a q)+\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(a q) \rightarrow 2 \mathrm{NaNO}_{3}(a q)+\mathrm{CaCO}_{3}(s)

The student decides to first determine [ OH−\mathrm{OH}^{-}] in the solution, then use that result to calculate the initial concentration of CO32−(aq)\mathrm{CO}_{3}{ }^{2-}(a q).

Identify a laboratory method (not titration) that the student could use to collect data to determine [OH−]\left[\mathrm{OH}^{-}\right] in the solution.

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