4 A 1.06-gram sample of limestone (mainly calcium carbonate) was dissolved in an acidic solution, and then the calcium w

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4 A 1 06 Gram Sample Of Limestone Mainly Calcium Carbonate Was Dissolved In An Acidic Solution And Then The Calcium W 1 (103.56 KiB) Viewed 86 times

4 A 1.06-gram sample of limestone (mainly calcium carbonate) was dissolved in an acidic solution, and then the calcium was precipitated as insoluble calcium oxalate (CaC204). The CaC204 precipitate is filtered, washed, and is then dissolved in acid. The resulting solution was treated with KMnO4 (Potassium permanganate). It was found that 0.694 grams of KMnO4 were required to react completely with the solution. Determine the percentage of CaO in the original sample. (KMnO4: 158 g/mol, Ca: 40 g/mol, O: 16 g/mol) Hint: The unbalanced redox equation involved is: (C204)-2 + (MnO4)-1- > CO2 + (Mn)+2 ===== (Non-anonymous question) (6/15 Points)