Show units and use correct number of significant figures Sample Number Mass of H

Question

Show units and use correct number of significant figures Sample Number Mass of HA Initial Volume Volume of NaOH (aq) Determination of the molar mass of unknown acid: Molarity of NaOH (aq) Mass of HA Initial volume NaOH (aq) Total volume at endpoint Moles of HA Mass of HA Initial volume NaOH (aq) Total volume at endpoint Moles of HA Mass of HA initial volume NaOH (aq) fatal volume at endpoint doles of HA verge Molar Mass of HA final volume NaOH (aq) Molar Mass HA Final volume NaOH (aq) Molar Mass HA Final volume NaOH (aq) Molar Mass HA

Explanation / Answer

Initial

mass = 0.126 g of acid

Assume a molarity of base of 0.1 M since none is stated

mol of NaOH = MV = 0.1 * (8.21-0)/1000 = 0.000821 mol of NaOH = 0.000821 mol of H+

MW = mass/mol = 0.126/0.000821 = 153.47 g/mol

apply same logic for each trial

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