If you make 100 different measurements, what single value/type would you use to describe your measurement? or How would you summarize your measurements?

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -

Definitely 25.3 degrees celsius 

The answer your looking for is that both valance is 1 because they are both in the alkali group