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Question 1: Stoichiometry and Concentration You work as a senior scientist and while inspecting the lab one day you see a bottle simply labeled \"Na$_2$SO$_4$ Solution\". You ask the associate researcher working at that bench to find out the concentration of this solution, and she mixes 250.0 mL of it with 250.0 mL of a 0.500 M BaCl$_2$ solution. After she did the mixing, a precipitate formed. She then performed a filtration and collected 12.5 grams of a pure solid. Assuming that the precipitation reaction yield was 100.0%, what was the concentration (in molar) of the unknown Na$_2$SO$_4$ solution? Question 2: Ionic Strength and Activity Coefficients a) Calculate the concentration of [Hg$_2^{2+}$] in equilibrium with 0.010 M KCl saturated with Hg$_2$Cl$_2$. b) Find the concentration of hydronium ions and the pH of 0.05 M LiNO$_3$. Assume the temperature is 25 degrees C. Hint: you may need the activity coefficients of H$^+$ and OH$^-$ which are listed in Table 8-1 in your textbook.

          Question 1: Stoichiometry and Concentration
You work as a senior scientist and while inspecting the lab one day you see a bottle
simply labeled \"Na$_2$SO$_4$ Solution\". You ask the associate researcher working at that
bench to find out the concentration of this solution, and she mixes 250.0 mL of it with
250.0 mL of a 0.500 M BaCl$_2$ solution. After she did the mixing, a precipitate formed.
She then performed a filtration and collected 12.5 grams of a pure solid. Assuming
that the precipitation reaction yield was 100.0%, what was the concentration (in
molar) of the unknown Na$_2$SO$_4$ solution?
Question 2: Ionic Strength and Activity Coefficients
a) Calculate the concentration of [Hg$_2^{2+}$] in equilibrium with 0.010 M KCl saturated
with Hg$_2$Cl$_2$.
b) Find the concentration of hydronium ions and the pH of 0.05 M LiNO$_3$. Assume the
temperature is 25 degrees C. Hint: you may need the activity coefficients of H$^+$ and
OH$^-$ which are listed in Table 8-1 in your textbook.

Question 1: Stoichiometry and Concentration
You work as a senior scientist and while inspecting the lab one day you see a bottle
simply labeled N̈a2SO4 Solution.̈ You ask the associate researcher working at that
bench to find out the concentration of this solution, and she mixes 250.0 mL of it with
250.0 mL of a 0.500 M BaCl2 solution. After she did the mixing, a precipitate formed.
She then performed a filtration and collected 12.5 grams of a pure solid. Assuming
that the precipitation reaction yield was 100.0%, what was the concentration (in
molar) of the unknown Na2SO4 solution?
Question 2: Ionic Strength and Activity Coefficients
a) Calculate the concentration of [Hg2^2+] in equilibrium with 0.010 M KCl saturated
with Hg2Cl2.
b) Find the concentration of hydronium ions and the pH of 0.05 M LiNO3. Assume the
temperature is 25 degrees C. Hint: you may need the activity coefficients of H^+ and
OH^- which are listed in Table 8-1 in your textbook.

Added by Sean W.

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