2. A solution that may contain Cu, Bi?", Sn*, or Sb* is treated with thioacetamide in an acidic medium. The black precipitate which forms is partly soluble in strongly basic solution. The precipitate which remains is soluble in 6 M HNO, and gives only a white precipitate upon the addition of NH,OH. The basic solution, when acidified, produces an orange precipitate.. Which group II ions are present? Which are absent? Which are in doubt? How would you remove all doubt?
2. A solution that may contain Cu, Bi?", Sn*, or Sb* is treated with thioacetamide in an acidic medium. The black precipitate which forms is partly soluble in strongly basic solution. The precipitate which remains is soluble in 6 M HNO, and gives only a white precipitate upon the addition of NH,OH. The basic solution, when acidified, produces an orange precipitate.. Which group II ions are present? Which are absent? Which are in doubt? How would you remove all doubt?
Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter37: Qualitative Analysis Of Group Ii Cations
Section: Chapter Questions
Problem 3ASA
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![2. A solution that may contain Cu²*, Bi²*, Sn*, or Sb2* is treated with thioacetamide in an acidic
medium. The black precipitate which forms is partly soluble in strongly basic solution. The
precipitate which remains is soluble in 6 M HNO, and gives only a white precipitate upon the
addition of NH¸OH. The basic solution, when acidified, produces an orange precipitate.. Which
group II ions are present? Which are absent? Which are in doubt? How would you remove all
doubt?
4+](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F722a63f9-4fa6-4f5e-8394-c52a544fb2db%2F15003923-8078-4d86-9a0c-2190b08afaeb%2F5thjkvp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2. A solution that may contain Cu²*, Bi²*, Sn*, or Sb2* is treated with thioacetamide in an acidic
medium. The black precipitate which forms is partly soluble in strongly basic solution. The
precipitate which remains is soluble in 6 M HNO, and gives only a white precipitate upon the
addition of NH¸OH. The basic solution, when acidified, produces an orange precipitate.. Which
group II ions are present? Which are absent? Which are in doubt? How would you remove all
doubt?
4+
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