Limestone consists mainly of the mineral calcite, CaCO3 (FM 100.09 g/mol). The carbonate content of 0.6070 g of powdered limestone was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCl, and heating to dissolve the solid and expel CO₂: CaCO3 + 2 H+ Ca²+ + H₂O + CO₂t The excess acid required 33.15 mL of 0.1317 M NaOH for complete titration to a phenolphthalein end point. H+ + OH H₂O Find the weight percent of calcite, CaCO3 (FM 100.09 g/mol), in limestone.

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Limestone consists mainly of the mineral calcite, CaCO3 (FM 100.09 g/mol). The carbonate content of 0.6070 g of powdered limestone
was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCl, and heating to dissolve the solid and expel CO₂:
CaCO3 + 2 H+ Ca²+ + H₂O + CO₂t
The excess acid required 33.15 mL of 0.1317 M NaOH for complete titration to a phenolphthalein end point.
H+ + OH
H₂O
Find the weight percent of calcite, CaCO3 (FM 100.09 g/mol), in limestone.
Transcribed Image Text:Limestone consists mainly of the mineral calcite, CaCO3 (FM 100.09 g/mol). The carbonate content of 0.6070 g of powdered limestone was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCl, and heating to dissolve the solid and expel CO₂: CaCO3 + 2 H+ Ca²+ + H₂O + CO₂t The excess acid required 33.15 mL of 0.1317 M NaOH for complete titration to a phenolphthalein end point. H+ + OH H₂O Find the weight percent of calcite, CaCO3 (FM 100.09 g/mol), in limestone.
Solid residue weighing 7.158 g from an aluminum refining process was dissolved in acid to give Al³+ in solution.
The solution was treated with 8-hydroxyquinoline to precipitate (8-hydroxyquinoline)3Al (FM 462.462 g/mol), which was ignited to give
Al2O3 (FM 101.961 g/mol) weighing 1.178 g.
Find the weight percent of Al (FM 26.982 g/mol) in the original mixture.
Transcribed Image Text:Solid residue weighing 7.158 g from an aluminum refining process was dissolved in acid to give Al³+ in solution. The solution was treated with 8-hydroxyquinoline to precipitate (8-hydroxyquinoline)3Al (FM 462.462 g/mol), which was ignited to give Al2O3 (FM 101.961 g/mol) weighing 1.178 g. Find the weight percent of Al (FM 26.982 g/mol) in the original mixture.
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