For a number of years, it was not clear whether mercury(I) ions existed in solution as Hg+...

For a number of years, it was not clear whether mercury(I) ions existed in solution as Hg+ or as . To distinguish between these two possibilities, we could set up the following system:

where soln A contained 0.263 g mercury(I) nitrate per liter and soln B contained 2.63 g mercury(I) nitrate per liter. If the measured emf of such a cell is 0.0289 V at 18°C, what can you deduce about the nature of the mercury(I) ions?