Question

A solution of HClO4 was standardized by dissolving 0.4125 g of primary standard grade HgO ina solution of KBR: HgO (s) + 4Br- + H2O → HgBr4 + 2OH-


The liberated OH- consumed 46.51 mL of the acid. calculate the molarity of the HClO4

Answer 1

mols primary std = g/molar mass = 0.4125/HgO = approximately 0.002 but you need to do that more accurately.

Convert mols HgO to mols OH^- = approx 0.004 (again redo all of this).

HClO4 + OH^- ==> H2O + ClO4^-
0.004 mols OH will consume 0.004 mol HClO4

M HClO4 = mols HClO4/L HClO4. = approx 0.004/0.04651 = ? (approx)

Answer 2

0.08190M

Answer 3

139