A 25.00-mL volume of commercial hydrogen peroxide solution was diluted to 250.0 mL in a volumetric flask.
Question:
A 25.00-mL volume of commercial hydrogen peroxide solution was diluted to 250.0 mL in a volumetric flask. Then 25.00 mL of the diluted solution were mixed with 200 mL of water and 20 mL of 3 M H2SO4 and titrated with 0.021 23 M KMnO4. The first pink color was observed with 27.66 mL of titrant. A blank prepared from water in place of H2O2 required 0.04 mL to give visible pink color. Using the H2O2 reaction in Table 15-3, find the molarity of the commercial H2O2.
Table 15-3
TABLE 15-3 Analytical applications of permanganate titrations Species analyzed Oxidation reaction Notes Fe* = Fe* + e Fe* is reduced to Fe* with Sn2 or a Jones reductor. Titration is carried out in 1 M H,SO, or 1 M HCI containing Mn*, H,PO, and H,SO,. Mn" inhibits oxidation of CI by MnO,. H,PO, complexes Fe to prevent formation of yellow Fe"-chloride complexes. Add 95% of titrant at 25°C, then complete titration at 55°-60°C. Fe H;C-0. H,C0, = 200, + 2H* + 2e Br Br = Br(g) + e Titrate in boiling 2 M H,SO, to remove Br,(g). H,O, = HNO, + H,0 = NO, + 3H* + 2e Titrate in 1 M H,SO, Add excess standard KMNO, and back-titrate after 15 min at 40°C with Fe2*. H,O, 0,(g) + 2H* + 2e HNO, As Sh = HASO, + 2H* + 2e H;SbO, + H,0 = H,SbO, + 2H* + 2e Mo + 2H,0 = MoO; + 4H* + 3e H,AsO, + H;0 Titrate in 1 M HCI with KI or ICl catalyst. Titrate in 2 M HCI. Reduce Mo in a Jones reductor, and run the Mot into excess Fe* in 1 M H,SO,. Titrate the Fe+ formed. Reduce W with Pb(Hg) at 50°C and titrate in I M HCI. Reduce U to U with a Jones reductor. Expose to air to produce U**, which is titrated in 1 M H,So. Reduce Ti to Ti* with a Jones reductor, and run the T*into excess Fe* in 1 M H,SO,. Titrate the Fe* Mo w* + 2H,0 = wo* + 4H + 3e U* + 2H,0 = UO* + 4H* + 2e Ti* + H,0 = Tio* + 2H* +e that is formed. Mg". Ca, Sr Zn La, Th, Ph Ce", Bio", Ag H,C,O, = 2C0, + 2H + 2e Precipitate the metal oxalate. Dissolve in acid and titrate the H;C,0. Ва Peroxydisulfate is added to excess standard Fe* containing H,PO, Unreacted Fe2 is titrated with Mno.. so; + 2Fe* + 2H* = 2Fe* + 2HSO, PO Mo + 2H;O (NH,),PO, - 12M00, is precipitated and dissolved in H,SO. The Mo(VI) is reduced (as above) and titrated. MoO* + 4H* + 3e
Step by Step Answer:
2MnCO 4 5H 2 O 2 6H 2Mn 2 5O 2 8H 2 O 2766004 2762 mL of 0021 23 ...View the full answer
Related Video
Hydrogen peroxide can be used as a mild antiseptic to curb superficial skin infections such as athlete’s foot, but only in diluted quantities. To combat stinky feet, try soaking your feet in a solution of 1 part 3% hydrogen peroxide and 3 parts warm water for 15-20 minutes, then drying them thoroughly. This will kill odor-causing bacteria and soften your feet. To treat athlete\'s foot, you can use a similar solution, but only in diluted quantities, and soak your feet for 30 minutes. Hydrogen peroxide can also be used to keep vegetables fresh by adding 1/4 cup to a bowl of cold water, soaking the vegetables for 20-30 minutes, then draining, drying, and refrigerating them. Alternatively, you can spray vegetables with a solution of 3% hydrogen peroxide and let them stand for a few minutes before rinsing and drying. To keep leftover salad fresh, spray it with a solution of 1/2 cup water and 1 Tbsp. 3% hydrogen peroxide, drain, cover, and refrigerate.
Students also viewed these Chemical Engineering questions
-
The concentration of a hydrogen peroxide solution can be conveniently determined by titration against a standardized potassium permanganate solution in an acidic medium according to the following...
-
Hydrogen peroxide, H2O2, is a colorless liquid. A concentrated solution of it is used as a source of oxygen for rocket propellant fuels. Dilute aqueous solutions are used as a bleach. Analysis of a...
-
Hydrogen peroxide undergoes a first-order decomposition to water and O2 in aqueous solution. The rate constant at 25oC is 7.40 104/s. Calculate the volume of O2 obtained from the decomposition...
-
What does the following code fragment print? String \(s=\) "He11o World"; s. toUpperCase(); s. substring (6, 11); StdOut.println(s);
-
Yahoo! Inc.s recent financial statements contain the following selected data (in thousands). Current assets ...........$ 4,594,772 Total assets ............ 14,936,030 Current liabilities ............
-
Monster Beverage is considering purchasing a new canning machine. This machine costs $3,500,000 up front. Required return = 11.3% What is the present value of all future cash flows? Note: Do not...
-
Compute the autocorrelation function of a periodic square wave with zero mean value and compare this result with that of a sinusoidal wave of the same period. Assume the amplitudes to be the same for...
-
On January 1, 2013, Plano Company acquired 8 percent (16,000 shares) of the outstanding voting shares of the Sumter Company for $192,000, an amount equal to Sumters underlying book and fair value....
-
Where can the state statutes be found pertaining to filing Governmental Tort Claims? [Citation Please] Where can the federal statutes be found pertaining to Governmental Tort Claims? [Citiation...
-
Jose and Gabriela Perez, of Bridgewater, Virginia, hope to sell their large home for $390,000 and retire to a smaller residence valued at $153,000. After they sell the property, they plan to invest...
-
When 25.00 mL of unknown were passed through a Jones reductor, molybdate ion (MoO 2- 4 ) was converted into Mo 3+ . The filtrate required 16.43 mL of 0.010 33 M KMnO 4 to reach the purple end point....
-
Two possible reactions of MnO 4 with H 2 O 2 to produce O 2 and Mn 2 are (a) Complete the half-reactions for both schemes by adding e - , H 2 O, and H - and write a balanced net equation for each...
-
Repeat the requirements for the problem specified in the table if the bolts and nuts are replaced with cap screws that are threaded into tapped holes in the cast-iron cylinder. Problem 8-33, the...
-
Charges q 1 , q 2 , and q 3 are all along the same line with q 1 on the left, q 3 on the right, and q 2 exactly midway between q 1 and q 3 . q 1 = 1 . 0 C , q 2 = 2 . 0 C and q 3 = + 4 . 0 C . What...
-
1. Write the equation of momentum for an inelastic collision of two cars, of mass1 and mass 2? 2. Write the two equations necessary for solving an elastic collision of two cars, of mass1 and mass 2?...
-
Scenario 1: The Very Busy Computer Media and Storage Administrator John has been with Dynamic Software for five years. In that time, he has become the go-to person for system backups and computer...
-
Two buckets, each of mass 7 . 0 kg , are joined together by a light inextensible string which passes over a frictionless pulley. If a 1 . 0 kg lump of clay is dropped from rest at a height of 2 . 0 m...
-
In a game of snooker, two balls of identical mass and radius collide on a horizontal table. A white ball moving at a speed 1 . 5 m / s parallel to the x axis collides off - centre with a stationary...
-
In 2024, Weisman Company had the following transactions related to the purchase of a property. All transactions are for cash unless otherwise stated. Feb. 7 Purchased real estate for $575,000, paying...
-
The graph of an equation is given. (a) Find the intercepts. (b) Indicate whether the graph is symmetric with respect to the x-axis, the y-axis, or the origin. -3 6 -6 3 x
-
Why would a reprecipitation be employed in a gravimetric analysis?
-
Explain how the quartz crystal microbalance at the opening of Chapter 2 measures small masses.
-
Explain what is meant by the statement, "Unless the complete history of any sample is known with certainty, the analyst is well advised not to spend his or her time in analyzing it."
-
Clark Company's current year income statement, comparative balance sheets, and additional information follow. For the year. (1) all sales are credit sales. (2) all credits to Accounts Receivable...
-
A process manufacturer reports the following: Conversion Units Beginning work in process inventory 194,000 Percent Complete 85% Units started this period 420,000 Units completed and transferred out...
-
Crane Windows manufactures and sells custom storm windows for three-season porches. Crane also provides installation service for the windows. The installation process does not involve changes in the...
Study smarter with the SolutionInn App