Homework Answers
95) Moles of Na2C2O4 = mass/molar mass
= 0.119/134 = 0.000888 moles
According to the reaction,
5 mole Na2C2O4 require 2 mole KMnO4
0.000888 mole Na2C2O4 require 2×0.000888/5 mole KMnO4
= 0.000355 moles
Volume of KMnO4 = moles×1000/molarity
= 0.000355×1000/0.0203
= 17.4 ml
Answer is c)
96) Using,
M1V1 (acid) = M2V2 (NaOH)
M1 = 20×0.0521/37.57
= 0.0277 M
Answer is E)
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PELIS JL 4 ELL Prol. UTVU 95. A solution of sodium oxalate (Na-C0A) in acidic solution...
A volume of 70.0 mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution...
A volume of 70.0 mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 15.2 mL of 1.50 M H2SO4 was needed? The equation is 2KOH(aq)+H2SO4(aq)?K2SO4(aq)+2H2O(l) part b: Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents...
7. The following reaction occurs in basic solution: H2O(aq) + MnO, (aq) + CIO (aq) -...
7. The following reaction occurs in basic solution: H2O(aq) + MnO, (aq) + CIO (aq) - MnO (s) + CIO, (ag) + OH(aq) When the equation is properly balanced, what is the sum of the lowest whole number coefficients? a. 20 b. 9 c. 10 d. 6 e. 12 8. What is the molarity of an Nal solution that contains 7.0 g of Nal in 21.0 mL of solution? a. 2.2 M b. 0.046 M c. 0.003 M d. 0.00014...
A titration is a procedure for determining the concentration of a solution by allowing it to...
A titration is a procedure for determining the concentration of a solution by allowing it to react with another solution of known concentration (called a standard solution). Acid-base reactions and oxidation-reduction reactions are used in titrations. For example, to find the concentration of an HCI solution (an acid), a standard solution of NaOH (a base) is added to a measured volume of HCl from a calibrated tube called a buret. An indicator is also present and it will change color...
Almost all Nak. Salts of nitrat 12. The combustion of 0.0272 mole of a hydrocarbon produces...
Almost all Nak. Salts of nitrat 12. The combustion of 0.0272 mole of a hydrocarbon produces 1.9609 H2O and 3.5927 g CO2. What is the molar mass of the hydrocarbon? 13. What is the pH of 2.9 10- M HCl(aq)? 14. What minimum mass of cobalt(II) nitrate must be added to 60.0 mL of a 0.0890 M phosphate solution in order to completely precipitate all of the phosphate as solid cobalt(II) phosphate? 2PO4 (aq) + 3 CO(NO3)2(aq) → CO3(PO4)2(5) +...
1. Which of the following compounds in an aqueous solution is a weak acid? A) H2S...
1. Which of the following compounds in an aqueous solution is a weak acid? A) H2S B) HI C) HBr D) H2SO4 E) HCIO 2. Identify the major ionic species present in an aqueous solution of H2SO4. A) S6, 036-(plus H2O as a neutral species) B) H', OH, 56,302- C) 2H, 56, 402- D) H', HS04 E) 24*, SO42- 3. Which of the following represents an acid-base neutralization reaction? A) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) B) SO2(g) +...
1. (4p) In an acidic aqueous solution, Fe2+ ions are oxidized to Fe3+ ions by MnO4": 5Fe2+(aq) + MnO4 (aq) + 8H(aq) → 5...
1. (4p) In an acidic aqueous solution, Fe2+ ions are oxidized to Fe3+ ions by MnO4": 5Fe2+(aq) + MnO4 (aq) + 8H(aq) → 5Fe3+ (aq) + Mn2(aq) + 4H2O(1) In part A of the experiment, suppose that 1.067 g of Fe(NH4)2(SO4)2.6H2O(s) are placed in a 250 ml Erlenmeyer flask to which 20 mL of water and 8 mL of 3 M H2SO4(aq) are added. The solution was titrated to the end point by adding 26.89 mL of KMnO4(aq) from the...
1. A solution of sodium hydroxide (NaOH) was standardized against potassium hydrogen phthalate (KHP). A known...
1. A solution of sodium hydroxide (NaOH) was standardized against potassium hydrogen phthalate (KHP). A known mass of KHP was titrated with the NaOH solution until a light pink color appeared using phenolpthalein indicator. Using the volume of NaOH required to neutralize KHP and the number of moles of KHP titrated, the concentration of the NaOH solution was calculated. Molecular formula of Potassium hydrogen phthalate: HKC8H404 Mass of KHP used for standardization (g) 0.5100 Volume of NaOH required to neutralize...
Permanganate ion oxidizes hydrogen peroxide in acidic solution according to the following equation: 2 MnO4–(aq) +...
Permanganate ion oxidizes hydrogen peroxide in acidic solution
according to the following equation:
2 MnO4–(aq) + 5
H2O2(aq) + 6 H+(aq) 2 Mn2+(aq) + 5
O2(g) + 8 H2O(l)
If 35.0 mL of an acidic 0.150 M KMnO4 solution is
required to consume all the H2O2 in 50.0 mL
of a disinfectant solution, what is the concentration of
H2O2 in the disinfectant?
0.0420 M
0.105 M
0.263 M
0.368 M
When a solution of barium hydroxide is mixed with a...
5. A 3.5 L sample of a 5.8 M NaCl solution is diluted to 55L. What...
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8-15 8. If S0.0 mL. of a 0.10 M solution of sodium chloride is mixed with...
8-15
8. If S0.0 mL. of a 0.10 M solution of sodium chloride is mixed with 50.0 mL of 0.10 M magnesium chloride, what is the molar concentration of chloride in the resulting solution? a. 0.10M b. 0.20 M c. 0.05 M d. 0.15 M e. 0.25 M 9. What would be the products in the ionic equation for the following reaction? 2HBr(aq) + 2KOH(aq) → products 1. KTaq) and Br(aq); tl. KH(aq); III. H,0(1); IV KBr(s); V. BORI(aq); VI....
7. The following reaction occurs in basic solution: H2O(aq) + MnO, (aq) + CIO (aq) - MnO (s) + CIO, (ag) + OH(aq) When the equation is properly balanced, what is the sum of the lowest whole number coefficients? a. 20 b. 9 c. 10 d. 6 e. 12 8. What is the molarity of an Nal solution that contains 7.0 g of Nal in 21.0 mL of solution? a. 2.2 M b. 0.046 M c. 0.003 M d. 0.00014...
A titration is a procedure for determining the concentration of a solution by allowing it to react with another solution of known concentration (called a standard solution). Acid-base reactions and oxidation-reduction reactions are used in titrations. For example, to find the concentration of an HCI solution (an acid), a standard solution of NaOH (a base) is added to a measured volume of HCl from a calibrated tube called a buret. An indicator is also present and it will change color...
Almost all Nak. Salts of nitrat 12. The combustion of 0.0272 mole of a hydrocarbon produces 1.9609 H2O and 3.5927 g CO2. What is the molar mass of the hydrocarbon? 13. What is the pH of 2.9 10- M HCl(aq)? 14. What minimum mass of cobalt(II) nitrate must be added to 60.0 mL of a 0.0890 M phosphate solution in order to completely precipitate all of the phosphate as solid cobalt(II) phosphate? 2PO4 (aq) + 3 CO(NO3)2(aq) → CO3(PO4)2(5) +...
1. Which of the following compounds in an aqueous solution is a weak acid? A) H2S B) HI C) HBr D) H2SO4 E) HCIO 2. Identify the major ionic species present in an aqueous solution of H2SO4. A) S6, 036-(plus H2O as a neutral species) B) H', OH, 56,302- C) 2H, 56, 402- D) H', HS04 E) 24*, SO42- 3. Which of the following represents an acid-base neutralization reaction? A) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) B) SO2(g) +...
1. (4p) In an acidic aqueous solution, Fe2+ ions are oxidized to Fe3+ ions by MnO4": 5Fe2+(aq) + MnO4 (aq) + 8H(aq) → 5Fe3+ (aq) + Mn2(aq) + 4H2O(1) In part A of the experiment, suppose that 1.067 g of Fe(NH4)2(SO4)2.6H2O(s) are placed in a 250 ml Erlenmeyer flask to which 20 mL of water and 8 mL of 3 M H2SO4(aq) are added. The solution was titrated to the end point by adding 26.89 mL of KMnO4(aq) from the...
1. A solution of sodium hydroxide (NaOH) was standardized against potassium hydrogen phthalate (KHP). A known mass of KHP was titrated with the NaOH solution until a light pink color appeared using phenolpthalein indicator. Using the volume of NaOH required to neutralize KHP and the number of moles of KHP titrated, the concentration of the NaOH solution was calculated. Molecular formula of Potassium hydrogen phthalate: HKC8H404 Mass of KHP used for standardization (g) 0.5100 Volume of NaOH required to neutralize...
Permanganate ion oxidizes hydrogen peroxide in acidic solution
according to the following equation:
2 MnO4–(aq) + 5
H2O2(aq) + 6 H+(aq) 2 Mn2+(aq) + 5
O2(g) + 8 H2O(l)
If 35.0 mL of an acidic 0.150 M KMnO4 solution is
required to consume all the H2O2 in 50.0 mL
of a disinfectant solution, what is the concentration of
H2O2 in the disinfectant?
0.0420 M
0.105 M
0.263 M
0.368 M
When a solution of barium hydroxide is mixed with a...
5. A 3.5 L sample of a 5.8 M NaCl solution is diluted to 55L. What is the molarity of the diluted solution? 6. Consider the reaction: K Slaq) + Co(NO3)2 (aq) → 2KNO3(aq) + Cos) What volume of 0.225 M K S solution is required to completely react with 175 mL of 0.115 M CO(NO3)2? 7. For each reaction, identify the Bronsted-Lowry acid, the Bronsted-Lowry base, the conjugate acid and the conjugate base a. Hl(aq) + H2O → H30*...
8-15
8. If S0.0 mL. of a 0.10 M solution of sodium chloride is mixed with 50.0 mL of 0.10 M magnesium chloride, what is the molar concentration of chloride in the resulting solution? a. 0.10M b. 0.20 M c. 0.05 M d. 0.15 M e. 0.25 M 9. What would be the products in the ionic equation for the following reaction? 2HBr(aq) + 2KOH(aq) → products 1. KTaq) and Br(aq); tl. KH(aq); III. H,0(1); IV KBr(s); V. BORI(aq); VI....
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