Recent content by slepsta

Temperature does not affect mass but it does effect the instrument measuring mass. Analytical balances are calibrated at room temperature.

That is interesting because the pKa values of nitro benzoic acids are as follows: Ortho 2.2, meta 3.5, and para 3.4. You might expect the ortho group to experience the same steric hinderance as in the phenol but the resonance contribution more than makes up for it.

no problem

You are correct Sirus. I meant to say Actual yield (in moles) is mass of ppt PbBr2 divided by its molecular weight.

I have not read the previous posts so perhaps this was already answered. The addition of a Nitro group, regardless of position, will make the phenol a stronger acid due to its inductive effect. However, nitro groups also add a resonance effect. It is impossible to show the reasonance effect...

The molecular weight of KHP is 204.22 g/mol. Assuming 16.98 mL was the amount needed to reach the end point your calculation is correct except for the molar mass of KHP.

Now you know that LiBr is the limiting reagent. To find theoretical yield balance the chemical equation: Pb(NO3)2 + 2LiBr ---> PbBr2 (s). This tells us that two moles of lithium bromide reacts to give lead (II) bromide. Thus, moles of PbBr2 = .5 moles of LiBr. So the theoretical yield of PbBr2...