Cyanides are released to the enviroment by cyanogenic organisms and by coal-refining industries. Metal ions such as Ni2+ form cyanide complexes in product-favored reactions: N/2+ (aq) + 4 CN (aq) 2+ [Ni(CN)4]2. The excess NI (aq) can be titrated with ethylenediaminetetraacetic acid (EDTA): N12+ (aq) EDTA4- (aq) → [Ni(EDTA)]2- 4 Use the molar masses below as needed: [Ni(CN)4]2 (162.76 g/mol) Ni (58.69 g/mol) CN (26.02 g/mol) EDTA, fully protonated (292.24) [Just give the numerical value, in correct significant figures, without the units. When necessary, use the cosmetic zero for your answer: write "0.1234", not ".1234"] 1. The Environmental Protection Agency (EPA) establishes a 3.5 μg CN /L limit for the protection of freshwater aquatic life. How much is this value in micromolar concentration? 2. How many moles of Ni2+ are needed to convert 1.00 mole of cyanide completely into [Ni(CN)412-2 3. How many mmoles of [Ni(CN) 412 are produced when 2.40 mmoles of Ni2+ are shaken with a wastewater sample containing 2.40 mmole of cyanide?? 4. How many milliliters of 0.200 M of Ni 2+ will react completely with 40.00 mL of 0.100 M CN"? 5. A 20.00-mL fungal extract containing free cyanide was added with 20.00 mL of 0.05000 M Ni2+. Exactly 40.00 mL of 0.0245 M EDTA 4 was needed to titrate the unreacted Ni2+ and reach the yellow-to-violet murexide end point. Calculate the millimolarity of cyanide in the fungal extract.
Cyanides are released to the enviroment by cyanogenic organisms and by coal-refining industries. Metal ions such as Ni2+ form cyanide complexes in product-favored reactions: N/2+ (aq) + 4 CN (aq) 2+ [Ni(CN)4]2. The excess NI (aq) can be titrated with ethylenediaminetetraacetic acid (EDTA): N12+ (aq) EDTA4- (aq) → [Ni(EDTA)]2- 4 Use the molar masses below as needed: [Ni(CN)4]2 (162.76 g/mol) Ni (58.69 g/mol) CN (26.02 g/mol) EDTA, fully protonated (292.24) [Just give the numerical value, in correct significant figures, without the units. When necessary, use the cosmetic zero for your answer: write "0.1234", not ".1234"] 1. The Environmental Protection Agency (EPA) establishes a 3.5 μg CN /L limit for the protection of freshwater aquatic life. How much is this value in micromolar concentration? 2. How many moles of Ni2+ are needed to convert 1.00 mole of cyanide completely into [Ni(CN)412-2 3. How many mmoles of [Ni(CN) 412 are produced when 2.40 mmoles of Ni2+ are shaken with a wastewater sample containing 2.40 mmole of cyanide?? 4. How many milliliters of 0.200 M of Ni 2+ will react completely with 40.00 mL of 0.100 M CN"? 5. A 20.00-mL fungal extract containing free cyanide was added with 20.00 mL of 0.05000 M Ni2+. Exactly 40.00 mL of 0.0245 M EDTA 4 was needed to titrate the unreacted Ni2+ and reach the yellow-to-violet murexide end point. Calculate the millimolarity of cyanide in the fungal extract.
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter19: Complex Ions
Section: Chapter Questions
Problem 4QAP: Platinum(II) forms many complexes, among them those with the following ligands. Give the formula and...
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Question
![Cyanides are released to the enviroment by cyanogenic organisms and by coal-refining industries. Metal
ions such as Ni2+ form cyanide complexes in product-favored reactions:
N/2+
(aq) + 4 CN (aq)
2+
[Ni(CN)4]2.
The excess NI (aq) can be titrated with ethylenediaminetetraacetic acid (EDTA):
N12+
(aq) EDTA4-
(aq) → [Ni(EDTA)]2-
4
Use the molar masses below as needed:
[Ni(CN)4]2 (162.76 g/mol)
Ni (58.69 g/mol)
CN (26.02 g/mol)
EDTA, fully protonated (292.24)
[Just give the numerical value, in correct significant figures, without the units. When necessary, use the
cosmetic zero for your answer: write "0.1234", not ".1234"]
1. The Environmental Protection Agency (EPA) establishes a 3.5 μg CN /L limit for the protection of
freshwater aquatic life. How much is this value in micromolar concentration?
2. How many moles of Ni2+ are needed to convert 1.00 mole of cyanide completely into [Ni(CN)412-2
3. How many mmoles of [Ni(CN) 412 are produced when 2.40 mmoles of Ni2+ are shaken with a
wastewater sample containing 2.40 mmole of cyanide??
4. How many milliliters of 0.200 M of Ni 2+ will react completely with 40.00 mL of 0.100 M CN"?
5. A 20.00-mL fungal extract containing free cyanide was added with 20.00 mL of 0.05000 M
Ni2+. Exactly 40.00 mL of 0.0245 M EDTA 4 was needed to titrate the unreacted Ni2+ and reach the
yellow-to-violet murexide end point. Calculate the millimolarity of cyanide in the fungal extract.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2480c5c0-690d-472b-9712-65962b3732cd%2F5d78cd0b-db94-4110-bb8e-cb71438332e8%2Fncek0mb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Cyanides are released to the enviroment by cyanogenic organisms and by coal-refining industries. Metal
ions such as Ni2+ form cyanide complexes in product-favored reactions:
N/2+
(aq) + 4 CN (aq)
2+
[Ni(CN)4]2.
The excess NI (aq) can be titrated with ethylenediaminetetraacetic acid (EDTA):
N12+
(aq) EDTA4-
(aq) → [Ni(EDTA)]2-
4
Use the molar masses below as needed:
[Ni(CN)4]2 (162.76 g/mol)
Ni (58.69 g/mol)
CN (26.02 g/mol)
EDTA, fully protonated (292.24)
[Just give the numerical value, in correct significant figures, without the units. When necessary, use the
cosmetic zero for your answer: write "0.1234", not ".1234"]
1. The Environmental Protection Agency (EPA) establishes a 3.5 μg CN /L limit for the protection of
freshwater aquatic life. How much is this value in micromolar concentration?
2. How many moles of Ni2+ are needed to convert 1.00 mole of cyanide completely into [Ni(CN)412-2
3. How many mmoles of [Ni(CN) 412 are produced when 2.40 mmoles of Ni2+ are shaken with a
wastewater sample containing 2.40 mmole of cyanide??
4. How many milliliters of 0.200 M of Ni 2+ will react completely with 40.00 mL of 0.100 M CN"?
5. A 20.00-mL fungal extract containing free cyanide was added with 20.00 mL of 0.05000 M
Ni2+. Exactly 40.00 mL of 0.0245 M EDTA 4 was needed to titrate the unreacted Ni2+ and reach the
yellow-to-violet murexide end point. Calculate the millimolarity of cyanide in the fungal extract.
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