. To determine the amount of dissolved oxygen in water sample, series of redox reactions are carried out. Reaction 1:2Mn²+ (aq) + O₂(g) + 40H(a) → 2MnO₂(s) + 2H₂O(1) Reaction 2: MnO₂(s) + 2H(aq) + 4H*(aq) → Mn²+ (aq) + ₂(aq) + 2H₂O(1) Reaction 3: 1₂(aq) + 2S₂O3(aq) → S406² (aq) + 2H(aq) If a 25.0 cm³ of water sample required 15.70 cm³ of a 0.00100 M Na2S2O3 solution to react with iodine liberated from the redox reaction, determine the mass of dissolved oxygen in this sample. Ano 1.256 x 104
. To determine the amount of dissolved oxygen in water sample, series of redox reactions are carried out. Reaction 1:2Mn²+ (aq) + O₂(g) + 40H(a) → 2MnO₂(s) + 2H₂O(1) Reaction 2: MnO₂(s) + 2H(aq) + 4H*(aq) → Mn²+ (aq) + ₂(aq) + 2H₂O(1) Reaction 3: 1₂(aq) + 2S₂O3(aq) → S406² (aq) + 2H(aq) If a 25.0 cm³ of water sample required 15.70 cm³ of a 0.00100 M Na2S2O3 solution to react with iodine liberated from the redox reaction, determine the mass of dissolved oxygen in this sample. Ano 1.256 x 104
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![3. Sodium carbonate, Na₂CO3 can be found in pure form and it can be used to
standardize acid solutions. What is the molarity of an HCI solution if 28.3 mL
of the solution is required to react with 0.256 g of Na2CO3. Calculate the
volume of the gas produced at STP. [Given relative molecular mass, Mr of
Na2CO3 = 106.01, HCI = 36.46, CO₂ = 44.01 g/mol]
[Ans: 0.171 M, 0.0541 dm³]
4. A sample of a copper ore with a mass of 0.4875 g was dissolved in acid. A
solution of potassium iodide was added, which cause the reaction
2Cu²+ (aq) + 51-(aq) → 13(aq) + 2Cul(s)
The 13 that formed reacted with exactly 30.06 mL of 0.0210 M Na2S2O3
according to the following equation.
13(aq) + 2S2O3²-(aq) → 31-(aq) + S406²-(aq)
[Relative atomic mass, ArCu =63.55, 1 = 126.9, Na =23.00, S = 32.06, O =
16.00 g/mol]
a) Calculate the percentage by mass of copper in ore
b) If the ore contained CUCO3, determine the percentage by mass of CUCO3
in the ore.
[Ans: a) 8.23%, b) 16.0 %]
5. A sample of a MgBr2 with a mass of z g is dissolved in an excess of
concentrated sulfuric acid to produce MgSO4 and HBr gas.
MgBr2(s) + H₂SO4(aq) → MgSO4(aq) + 2HBr(g)
All HBr gas liberated is further oxidized by conc. H₂SO4 and produces Br2 and
SO₂ gas at room temperature and pressure along with water.
2HBr(g) + H₂SO4(aq) → Br2(g) + SO2(g) + 2H2O(1)
If the total volume of gas collected is 200 mL, determine the value of z.
[Ans: 0.768 g]
6. To determine the amount of dissolved oxygen in water sample, series of redox
reactions are carried out.
Reaction 1: 2Mn²+ (aq) + O₂(g) + 40H (a) → 2MnO₂(s) + 2H₂O(1)
Reaction 2: MnO2(s) + 2H(aq) + 4H+ (aq) → Mn²+ (aq) + 12(aq) + 2H₂O(l)
Reaction 3: 1₂(aq) + 2S2O3(aq) → S406²(aq) + 2H(aq)
If a 25.0 cm³ of water sample required 15.70 cm³ of a 0.00100 M Na2S2O3
solution to react with iodine liberated from the redox reaction, determine the
mass of dissolved oxygen in this sample.
[Ans: 1.256 x 10* gl](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F99035a01-21cc-457e-aa7b-608d8c373f3f%2F874b1408-1ac3-4764-a7ed-7c0e558e0482%2Fgi1dnk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3. Sodium carbonate, Na₂CO3 can be found in pure form and it can be used to
standardize acid solutions. What is the molarity of an HCI solution if 28.3 mL
of the solution is required to react with 0.256 g of Na2CO3. Calculate the
volume of the gas produced at STP. [Given relative molecular mass, Mr of
Na2CO3 = 106.01, HCI = 36.46, CO₂ = 44.01 g/mol]
[Ans: 0.171 M, 0.0541 dm³]
4. A sample of a copper ore with a mass of 0.4875 g was dissolved in acid. A
solution of potassium iodide was added, which cause the reaction
2Cu²+ (aq) + 51-(aq) → 13(aq) + 2Cul(s)
The 13 that formed reacted with exactly 30.06 mL of 0.0210 M Na2S2O3
according to the following equation.
13(aq) + 2S2O3²-(aq) → 31-(aq) + S406²-(aq)
[Relative atomic mass, ArCu =63.55, 1 = 126.9, Na =23.00, S = 32.06, O =
16.00 g/mol]
a) Calculate the percentage by mass of copper in ore
b) If the ore contained CUCO3, determine the percentage by mass of CUCO3
in the ore.
[Ans: a) 8.23%, b) 16.0 %]
5. A sample of a MgBr2 with a mass of z g is dissolved in an excess of
concentrated sulfuric acid to produce MgSO4 and HBr gas.
MgBr2(s) + H₂SO4(aq) → MgSO4(aq) + 2HBr(g)
All HBr gas liberated is further oxidized by conc. H₂SO4 and produces Br2 and
SO₂ gas at room temperature and pressure along with water.
2HBr(g) + H₂SO4(aq) → Br2(g) + SO2(g) + 2H2O(1)
If the total volume of gas collected is 200 mL, determine the value of z.
[Ans: 0.768 g]
6. To determine the amount of dissolved oxygen in water sample, series of redox
reactions are carried out.
Reaction 1: 2Mn²+ (aq) + O₂(g) + 40H (a) → 2MnO₂(s) + 2H₂O(1)
Reaction 2: MnO2(s) + 2H(aq) + 4H+ (aq) → Mn²+ (aq) + 12(aq) + 2H₂O(l)
Reaction 3: 1₂(aq) + 2S2O3(aq) → S406²(aq) + 2H(aq)
If a 25.0 cm³ of water sample required 15.70 cm³ of a 0.00100 M Na2S2O3
solution to react with iodine liberated from the redox reaction, determine the
mass of dissolved oxygen in this sample.
[Ans: 1.256 x 10* gl
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