Addition of a 1.0-mL portion of 0.40 M Na2S2O3 solution (S2O32- ions) convert I2 (black with...
Addition of a 1.0-mL portion of 0.40 M Na2S2O3 solution (S2O32- ions) convert I2 (black with starch) back to I⁻ (clear) into the solution via the following reaction: I2(aq) + 2 S2O32-(aq) → 2 I⁻(aq) + S4O62-(aq)
1. Consider the reaction solution, which contains 25.0 mL of 0.40 M (NH4)2S2O8 in the total volume of 100.0 mL. Calculate the initial number of moles of S2O82- ion in the solution:______moles?
2. From Question 2 and 3, determine the amount of S2O82- ion remaining in solution after the I2 from question 2 is produced: ______moles?
3. If the color change occurred in 94 seconds, calculate the rate of disappearance of S2O82- in M/s. _Hint: Answer from Question 2 and the total volume is 100-mL):
_________ x 10-5M/s?
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Addition of a 1.0-mL portion of 0.40 M Na2S2O3 solution (S2O32-
ions) convert I2 (black with...
I have a reaction that has three elementary steps: 3I- +S2O82- ---> I3- + 2 SO42-...
I have a reaction that has three elementary steps: 3I- +S2O82- ---> I3- + 2 SO42- (this is the RLS) I3 + 2 S2O32- ---> 3 I- + S4O62- starch + I3- ---> starch - I3- complex. (color change to indicate rxn is over) In multiple trials I change the concentrations to see its effect on the rate of the rxn. But the reagents I'm using in this rxn are: (1) starch, Na2S2O3 , KI, KNO3 , and (2) (NH4)2S2O8...
1) Calculate the pH of a solution produced by mixing 100.0 mL of 0.10 M HCl(aq)...
1) Calculate the pH of a solution produced by mixing 100.0 mL of 0.10 M HCl(aq) and 100.0 mL of 0.20 M NaOH(aq). 2) Calculate the pH of an aqueous solution made by mixing 100.0 mL of 0.40 M NH4Cl and 50.0 mL of 0.40 M NaOH. The pKa of NH4+ is 9.24.
Use these 2 reactions to answer Question 4: 2Cu2+ + 4KI → 2CuI + I2 + 4K+ (rxn 1) I2 + 2Na2S2O3 → 2NaI + Na2S4O6 (rxn 2) For rxn 1, 10.0 mL of a Cu2+ solution of unknown concentration was placed in...
Use these 2 reactions to answer Question 4: 2Cu2+ + 4KI → 2CuI + I2 + 4K+ (rxn 1) I2 + 2Na2S2O3 → 2NaI + Na2S4O6 (rxn 2) For rxn 1, 10.0 mL of a Cu2+ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added. Indicator was added and the solution was diluted with H2O to a total volume of 75 mL. For rxn 2, the solution from rxn 1...
please I need help with this one question. Titration Procedure Prepare your starch solution by dissolving...
please I need help with this one question. Titration Procedure Prepare your starch solution by dissolving 0.040g of vitex starch in 20 mL of water. Prepare your 3%diluted commercial bleach solution (3% of the concentration of the commercial bleach, by volume.) Do not discard as you will use this solution for each of your trials. Dependingonyourinstructor’schosenmethod;deliverexactly3mLofcommercialbleach solution to a 100mL volumetric flask using the burette that contains the class’s supply of bleach, or pour some from the bottle into a...
27) What is the concentration (molarity) of HCI in the final solution when 65 mL of...
27) What is the concentration (molarity) of HCI in the final solution when 65 mL of a 9.0 M HCl solution is diluted with pure water to a total volume of 0.15 L? 28) How many milliliters of a 9.0 M H2SO4 solution are needed to make 0. 45 L of a 3.5 M solution? A) 0. 18 mL B) 1.2 mL C) 180 mL D) 1200 mL 29) A student prepared a stock solution by dissolving 15.0 g of...
Question 69? What volume of 0.175 M Na_3PO_4 solution is completely react with 95 4 ml...
Question 69?
What volume of 0.175 M Na_3PO_4 solution is completely react with 95 4 ml of 0.102 M CuCl_2? Consider the reaction Li_2S(aq) + Co(NO_3)_29aq) rightarrow 2 LiNO_3 (aq) + CoS(s) What volume of 0.150 M Li_2 S solution is required to completely react with 125 mL of 0.150 M Co(NO_3)_2? What is the minimum amount of 6.0 M H_2SO_4. necessary to produce 25.0 g of H_2 (g) according to the reaction between aluminum and sulfuric acid? 2 Al...
• CIU TEXAS INSTRUM 2. A 50.00 ml sample of solution containing Fe?ions is titrated with a 0.0216 M KMnO4 solution....
• CIU TEXAS INSTRUM 2. A 50.00 ml sample of solution containing Fe?ions is titrated with a 0.0216 M KMnO4 solution. It required 20.62 ml of the KMnO4 solution to oxidize all the Fe? ions to Fe ions by the reaction: MnO4 (aq) + Fe? ) -------> Mn(ed) Felco (unbalanced) a) What was the concentration of Fel.ions in the sample solution? b) What volume of 0.0150 M K2Cr2O7 solution would it take to do the same titration? The reaction is:...
28) How many milliliters of a 9.0 M H2504 solution are needed to make 0.45 Lof...
28) How many milliliters of a 9.0 M H2504 solution are needed to make 0.45 Lof a 3.5 M solution? Vi=MzV2 - 3.5x450 175ml A) O. 18 ml B) 1.2 ml C) 180 ml D) 1200 ml 29) A student prepared a stock solution by dissolving 15.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0...
31. To what volume should you dilute 50.0 mL of a 12 M stock HNO3 solution...
31. To what volume should you dilute 50.0 mL of a 12 M stock HNO3 solution to obtain a 0.100 M HNO3 solution? MISSED THIS? Read Section 5.2; Watch KCV 5.2, IWE 5.3 react WILII 129 TIL U10.100 J D 35. What is the minimum amount of 6.0 M H2SO4 necessary to produce 25.0 g of Hz(8) according to the reaction between aluminum and sulfuric acid? MISSED THIS? Read Section 5.3; Watch IWE 5.4 2 Al(s) + 3 H2SO4(aq) -...
Question 5 5 pts A 77.0-mL sample of a 0.203 M potassium sulfate solution is mixed...
Question 5 5 pts A 77.0-mL sample of a 0.203 M potassium sulfate solution is mixed with 55.0 mL of a 0.226 M lead(II) nitrate solution and this reaction occurs: K2SO4(aq) + Pb(NO3)2 (aq) - 2 KNO3(aq) + PbSO4(s) The solid PbSO4 is collected, dried, and found to have a mass of 2.62 g. Determine the percent yield. 1 mole PbSO4 = 303.26g 91.1% 120% 69.5% 80.1% Question 29 5pi If 1.85 g MgO is combined with enough 1.00 M...
27) What is the concentration (molarity) of HCI in the final solution when 65 mL of a 9.0 M HCl solution is diluted with pure water to a total volume of 0.15 L? 28) How many milliliters of a 9.0 M H2SO4 solution are needed to make 0. 45 L of a 3.5 M solution? A) 0. 18 mL B) 1.2 mL C) 180 mL D) 1200 mL 29) A student prepared a stock solution by dissolving 15.0 g of...
Question 69?
What volume of 0.175 M Na_3PO_4 solution is completely react with 95 4 ml of 0.102 M CuCl_2? Consider the reaction Li_2S(aq) + Co(NO_3)_29aq) rightarrow 2 LiNO_3 (aq) + CoS(s) What volume of 0.150 M Li_2 S solution is required to completely react with 125 mL of 0.150 M Co(NO_3)_2? What is the minimum amount of 6.0 M H_2SO_4. necessary to produce 25.0 g of H_2 (g) according to the reaction between aluminum and sulfuric acid? 2 Al...
• CIU TEXAS INSTRUM 2. A 50.00 ml sample of solution containing Fe?ions is titrated with a 0.0216 M KMnO4 solution. It required 20.62 ml of the KMnO4 solution to oxidize all the Fe? ions to Fe ions by the reaction: MnO4 (aq) + Fe? ) -------> Mn(ed) Felco (unbalanced) a) What was the concentration of Fel.ions in the sample solution? b) What volume of 0.0150 M K2Cr2O7 solution would it take to do the same titration? The reaction is:...
28) How many milliliters of a 9.0 M H2504 solution are needed to make 0.45 Lof a 3.5 M solution? Vi=MzV2 - 3.5x450 175ml A) O. 18 ml B) 1.2 ml C) 180 ml D) 1200 ml 29) A student prepared a stock solution by dissolving 15.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0...
31. To what volume should you dilute 50.0 mL of a 12 M stock HNO3 solution to obtain a 0.100 M HNO3 solution? MISSED THIS? Read Section 5.2; Watch KCV 5.2, IWE 5.3 react WILII 129 TIL U10.100 J D 35. What is the minimum amount of 6.0 M H2SO4 necessary to produce 25.0 g of Hz(8) according to the reaction between aluminum and sulfuric acid? MISSED THIS? Read Section 5.3; Watch IWE 5.4 2 Al(s) + 3 H2SO4(aq) -...
Question 5 5 pts A 77.0-mL sample of a 0.203 M potassium sulfate solution is mixed with 55.0 mL of a 0.226 M lead(II) nitrate solution and this reaction occurs: K2SO4(aq) + Pb(NO3)2 (aq) - 2 KNO3(aq) + PbSO4(s) The solid PbSO4 is collected, dried, and found to have a mass of 2.62 g. Determine the percent yield. 1 mole PbSO4 = 303.26g 91.1% 120% 69.5% 80.1% Question 29 5pi If 1.85 g MgO is combined with enough 1.00 M...
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