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A: Answer is explained below.
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A: Given data: Mass of sample = 0.4352 g Volume of K2Cr2O7 = 29.77 mL Molarity of K2Cr2O7 = 0.01735 M
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A: The balanced chemical reactions are given below.
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Q: Calculate the percentage of nickel, chromium and iron in the alloy.
A: We are provided with: Weight of the sample containing Volume of the Concentration of A back…
Q: The amount of iron in a meteorite is determined by a redox titration using KMnO4 as the titrant. A…
A:
Q: When I was a boy, I watched Uncle Wilbur measure the iron content of runoff from his banana ranch.…
A: Beer–Lambert law A = ε l cA = absorbanceε = a constant ratio of (A) / (l) (c)l = length of cellc =…
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- The equilibrium constant for the reaction 2CrO42+2H+Cr2O72+H2O is 4.2 1014. The molar absorptivities for the two principal species in a solution of K2 Cr2 O2 are Four solutions were preparedby dissolving 4.00 10-4, 3.00 10-4, 2.00 10-4,and 1.00 10-4 moles of K2 Cr2 O7 in water and diluting to 1.00 L with a pH 5.60 buffer. Derive theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm, (b) 370 nm, and (c) 400 nm.WARIARTAM 2. 1.2589 g of a certain brand of milk powder required 25.89 mL of 0.01873M EDTA to titrate the calcium contained in the sample. (a) What is the percent calcium in the sample? (b) Would the true result be higher, lower, or not be affected if the milk powder sample has been slightly wet?A 110.00 mL solution of 0.00195 M A3B2 is added to a 160.00 mL solution of 0.00155 M C3D4. What is pQsp for A3D2?
- I1.6. A lo0mL solntion g 0.050MM tuffered to pHq.00 was titrates rith n+ 0. OSD OMEDTA. ca) Hhat is the egniralene volume, Ve in milliliters? (b) Caleulate Hhe concenpration f m" at ntQ7) what is the pH at the equivatent point in the titration of 5 mmol Potassium acid ph thalate dissolved in 100 mel of water and titrat ed with 0.1M NaoH 9 K, = 4 +r56 %3D Ans. : 8.46The redction Fe -> Fe + Ce 3+ + Ce IS rapid and reversable cit equilibrium throughout the titration, thus electrode poten tials for 2 half recctions ae always equal, as is electrode potential f the indicator used GIuen Fe as anglyte cincl Ce T as the titrunt ZEeq Show that + E° ce ce3t %3D た2t
- A. 2.00 ml sample of hydrogen peroxidesolution required 8.5ml of a permanganatesolution in titration. If each ml of thepermanganate solution is equivalent to0.007295g of Fe, what % w/v of H2O2 was inthe sampleA sample of Al;(SO.); weighing 7.52-g was dissolved in enough water and diluted to 250.0-mL. 100.0-mL of the dilution was transferred to another flask, 10.0-mL of 0.050M EDTA, 20-ml of buffer solution, 50-mL of alcohol and 2.0-ml dithizone TS were added. The resulting solution required 8.7-mL of 0.031M ZnSO, to reach the endpoint. (Note: Each ml of 0.050M EDTA is equivalent to 16.66-mg Al:(SO.);•18H;0). Compute for the percent purity of the sample.A 0.7120 g of iron ore was brought into solution and passed through a Jones reductor. Titration of Fe(II) produced required 39.21mL of 0.02086M KMnO4. Express the results of analysis in terms of (a) percent Fe (MM 55.85) and (b) percent Fe2O3 (Molar mass= 159.69). 5Fe+2 + MnO4- +8H+ → 5Fe+3 + Mn+2 + 4H2O
- Chromel is an alloy composed of nickel, iron and chromium.A 0.6472 g sample was dissolved and diluted to 250 mL. When a50 mL aliquot of 0.05182 M EDTA was mixed with an equal volumeof the diluted sample and all the three ions were chelated, a 5.11 mLback titration with 0.06241 M copper (II) was required.The chromium in a second 50 mL aliquot was masked through theaddition of hexamethylenetetramine, titration of the Fe and Nirequired 36.28 mL of 0.05182 M EDTA.Iron and chromium were masked with pyrophosphate in a third50 mL aliquot and the nickel was titrated with 25.91 mL of theEDTA solution.Calculate the percentage of nickel, chromium and iron in thealloy.Qq) Estimate the pH of abutter made by udding 1ogm Nå HCo, to 250 ml of asolution which is Saturated with Co, (0.032 M) ? Ka= 4#10=7 Ans.: 7.57The Sn in a 0.4352 g mineral specimen was reduced to the +2 state with Pb and titrated with 29.77 mL of 0.01735 M K2Cr2O7. Identify:1) balanced chemical reaction2) appropriate indicator and its type3) color at the end point4) % SnO2 in the sample