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Hi,May I please ask I’m doing an experiment on quantitative analysis of calcium carbonate and before doing the experiment I have to answer this:1)List four cases where back titration is used instead of direct titration. And 2) A mass or 0.150g of a sample of commercial CaCo3 was transferred into a 250mL Erlenmeyer flask.50.00 mL of 0.2275M HCL was pipetted into a sample and the solution was boiled for two minutes.The excess acid was titration with 0.1158M NaOH.The average NaOH Titre was 24.19 mL.Calculate the mass of CaCO3 in grams,present in the commercial sample.
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