Suggest a range of sample masses for the indicated primary standard if it is desired to use between 35 and 45 mL of titrant:
(a)0.175 M HClO4 titrated against Na2CO3 (CO2 product).
(b)0.085 M HCl titrated against Na2C2O4
Na2C2O4 → Na2CO3 + CO
CO32- + 2H+ → H2O + CO2
(c)0.150 M NaOH titrated against benzoic acid.
(d)0.050 M Ba(OH)2 titrated against KH(IO3)2.
(e)0.075 M HClO4 titrated against TRIS.
(f)0.050 M H2SO4 titrated against Na2B4O7.10H2O. Reaction: B4O72- + 2H3O+ + 3H2O → 4H3BO3
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