48. How much 0.0500 M EDTA is needed to titrate the Mg in a 0.1135-g of hydromagnesite, 3MgCO, Mg(OH)₂ 3H₂O (365.3 g/mol) 24.9 mL O 6.21 mL 50.8 mL O None of these

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter18: Principles Of Chemical Reactivity: Entropy And Free Energy
Section: Chapter Questions
Problem 44PS
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Answer the following questions.

Questions Nos. 48-49

48. How much 0.0500 M EDTA is needed to titrate the Mg in a 0.1135-g
of hydromagnesite, 3MgCO, Mg(OH)₂ 3H₂O (365.3 g/mol)
24.9 mL
6.21 mL
50.8 mL
O None of these
49. The KCIO3 (122.55 g/mol) in a 0.1862-g sample of an explosive was
determined by reaction with 50.00 mL of 0.01162 M Fe**. When the
reaction was complete, the excess Fe²+ was back-titrated with 13.26 mL
of 0.07654 M Ce**. Calculate the % KCIO, in the sample.
2+
CIO3 +6Fe²+ + 6H* → Cl¯ +3H₂O +6Fe³+
23.43%
52.60%
75.21%
O None of these
Transcribed Image Text:48. How much 0.0500 M EDTA is needed to titrate the Mg in a 0.1135-g of hydromagnesite, 3MgCO, Mg(OH)₂ 3H₂O (365.3 g/mol) 24.9 mL 6.21 mL 50.8 mL O None of these 49. The KCIO3 (122.55 g/mol) in a 0.1862-g sample of an explosive was determined by reaction with 50.00 mL of 0.01162 M Fe**. When the reaction was complete, the excess Fe²+ was back-titrated with 13.26 mL of 0.07654 M Ce**. Calculate the % KCIO, in the sample. 2+ CIO3 +6Fe²+ + 6H* → Cl¯ +3H₂O +6Fe³+ 23.43% 52.60% 75.21% O None of these
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