Question Brazilian Chemistry Olympiad - Successive dilutions of aqueous CaCO3 solution OBQ

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Professor Fabricio Valverde

Published on Premiered Dec 9, 2024
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Question from the Brazilian Chemistry Olympiad about successive dilution of calcium carbonate (CaCO3). The question presents five items to be answered, all related to concentration. In the chemistry laboratory, it is often necessary to perform consecutive dilutions of a sample for its analysis. Suppose that 100.0 mL of an aqueous solution of CaCO3 0.250 mol L–1 was diluted twice. In the first dilution, 20.0 mL of this solution were transferred to a 100 mL volumetric flask and the volume was completed with distilled water. Then, 10.0 mL of this diluted solution was transferred to another 100.0 mL flask and completed with distilled water. The dilution scheme is presented below: a) How many moles of CaCO3 were removed from the original solution for the first dilution? b) What is the concentration of CaCO3 in solution II? c) What is the concentration of CaCO3 in sample III? d) How many times is solution III less concentrated than solution I? e) To obtain 500.0 mL of a CaCO3 solution with a final concentration of 0.1 mol L–1, what should be the volume of the aliquot of the original sample? • Question from the book McMurry - Analysis of... • Question from ENEM 2024 - Step-by-Step - E... • Question from the book KOTZ - Step-by-Step - ... • Question from ITA - Step-by-Step - Preparation... • Question from FUVEST - Stoichiometric cal... / fabricio-de-carvalho-32a6a7131 / fa_valverde79 00:00 Introduction 00:22 Resolution of the question 02:43 Item (a) 04:43 Item (b) 06:43 Item (C) 09:31 Item (d) 11:37 Item (e) 18:02 Final considerations

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