answer both pls 1. Consider the following half-reaction. 4H+(aq) + O2(g) + 4e- → 2H2O(l) Eo...

answer both pls

1. Consider the following half-reaction.
4H⁺(aq) + O₂(g) + 4e^- → 2H₂O(l) E^o = 1.23 V
What is E, if the pressure of oxygen gas is 1.0 atmosphere and the pH is 2.92?
USE 2 DECIMAL PLACES. (Hint, are solids and pure liquids included in Q? Using LeChatelier's principle is E going to be larger or smaller?)

2. Mg₂C₂O₄(s) → 2Mg²⁺(aq) +C₂O₄^2-(aq) K_sp = 8.6 x 10^-5
What is Q_sp if 100 mL of 0.080 M Mg(N0₃)₂ is added to 50 mL of 0.032 M Na₂C₂O₄?

Expert Solution

Please note that for pure solids and liquids, Molarity = density of substance/molar mass of the substance; since both density and Molar mass have fixed values at constant temperature, the molarities of pure solids and liquids have fixed values.

It is for this reason that pure solids and liquids are not written in the expressions of equilibrium constants.

In question 2, the charge balance condition requires that for one oxalate ion (C2O4)2-, only one Mg2+ ion is required. The solution is given according to this correction.

(Please do give a thumbs up if you like this explanation. Your feedback fuels my efforts to improve myself)

queen_honey_blossom answered 2 years ago

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