H2 Chemistry 6 - Mole Concept and Stoichiometry: Back Titration

Name: Eclat Institute - Orchard Physics Practical Lab
Address: 150 Orchard Rd, Singapore, 238841, SG

What you will learn

2.50 g impure CaCO3 reacted with 50.0 cm^3 of 1.00 mol/dm^3 HCl, then excess HCl back-titrated with 0.500 mol/dm^3 NaOH.
Initial HCl = 0.0500 mol; excess from 20.0 cm^3 of NaOH at 1:1 ratio = 0.0100 mol; reacted HCl = 0.0400 mol.
Stoichiometric 1:2 ratio (CaCO3 : HCl) gives n(CaCO3) = 0.0200 mol; mass = 0.0200 x 100.1 = 2.00 g.

Keep the same topic and move to the explanation or a quick check.

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