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The amount of calcium carbonate (CaCO3; molar mass = 100.1 g mol-1) in the ore dolomite can be determined by gravimetric analysis. The dolomite sample is dissolved in acid and the calcium ions (Ca?") present are precipitated as calcium oxalate (CaC204, molar mass = 128.1 g mol"). The calcium oxalate is filtered, dried, and strongly heated to form calcium oxide (CaO; molar mass = 56.1 g mol'-). 1: In one analysis the mass of dolomite used was 3.72 g. The mass of calcium oxide formed was found to be 1.24 g. The percentage of calcium carbonate in the dolomite sample is closest to: 059.5 056.5 033.3 02.23 026.9 2. Two possible sources of error in this analysis are: |- the precipitate of calcium oxalate is not rinsed with water after being filtered. II - the calcium oxide is not heated to constant mass. Which of these two errors, if any, would lead to a result that is too high? Oniether I and II| Oll only

The amount of calcium carbonate (CaCO3; molar mass = 100.1 g mol-1) in the ore dolomite can be determined by gravimetric analysis. The dolomite sample is dissolved in acid and the calcium ions (Ca?") present are precipitated as calcium oxalate (CaC204, molar mass = 128.1 g mol"). The calcium oxalate is filtered, dried, and strongly heated to form calcium oxide (CaO; molar mass = 56.1 g mol'-). 1: In one analysis the mass of dolomite used was 3.72 g. The mass of calcium oxide formed was found to be 1.24 g. The percentage of calcium carbonate in the dolomite sample is closest to: 059.5 056.5 033.3 02.23 026.9 2. Two possible sources of error in this analysis are: |- the precipitate of calcium oxalate is not rinsed with water after being filtered. II - the calcium oxide is not heated to constant mass. Which of these two errors, if any, would lead to a result that is too high? Oniether I and II| Oll only

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter20: Chemistry Of Selected Transition Elements And Coordination Compounds
Section20.2: Iron And Steel: Pyrometallurgy
Problem 20.2PSP
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The amount of calcium carbonate (CaCO3; molar mass = 100.1 g mol1) in the ore dolomite can be determined by gravimetric analysis. The dolomite sample is dissolved in acid and the calcium ions (Ca2+) present are precipitated as calcium oxalate (CaC204, molar mass = 128.1 g mol'"). The calcium oxalate is filtered, dried, and strongly heated to form calcium oxide (Cao; molar mass = 56.1 g mol'"). 1: In one analysis the mass of dolomite used was 3.72 g. The mass of calcium oxide formed was found to be 1.24 g. The percentage of calcium carbonate in the dolomite sample is closest to: 059.5 056.5 033.3 02.23 026.9 2. Two possible sources of error in this analysis are: |- the precipitate of calcium oxalate is not rinsed with water after being filtered. II - the calcium oxide is not heated to constant mass. Which of these two errors, if any, would lead to a result that is too high? Oniether I and I Oll only
Transcribed Image Text:The amount of calcium carbonate (CaCO3; molar mass = 100.1 g mol1) in the ore dolomite can be determined by gravimetric analysis. The dolomite sample is dissolved in acid and the calcium ions (Ca2+) present are precipitated as calcium oxalate (CaC204, molar mass = 128.1 g mol'"). The calcium oxalate is filtered, dried, and strongly heated to form calcium oxide (Cao; molar mass = 56.1 g mol'"). 1: In one analysis the mass of dolomite used was 3.72 g. The mass of calcium oxide formed was found to be 1.24 g. The percentage of calcium carbonate in the dolomite sample is closest to: 059.5 056.5 033.3 02.23 026.9 2. Two possible sources of error in this analysis are: |- the precipitate of calcium oxalate is not rinsed with water after being filtered. II - the calcium oxide is not heated to constant mass. Which of these two errors, if any, would lead to a result that is too high? Oniether I and I Oll only
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