Chromate-dichromate system 1. Prepare a clean spot plate and label four wells. Place 5 drops of 0. 10 M K,Cro into wells 1 and 2, and 5 drops of 0. 10 M K_Cr.0, into wells 3 and 4. 2. Add 2 drops of 2. 0 M H ,SO̟ into wells 1 and 3. 3. Add 2 drops of 2.0 M NaOH into wells 2 and 4. 4. Observe the colors of the solutions. Well 1 2 3 Color of solution Predominant species responsible for color Give the reaction equilibrium that describes this system:
Q: Use your molecular modeling kit to determine the absolute configurations of the following compounds....
A: CIP Rules : Identify the chiral centers Give the priorities to the groups according to their atomic...
Q: Give the IUPAC name of the following structure: HO.
A:
Q: Calculate the pH of a 7.51 M solution of HBrO. The K, of HBRO is 2.50 x 10. Express your answer usin...
A:
Q: in which of the following diagrams, I-II, is a hydrogen bond correctly shown between molecules? ö: c...
A: Intermolecular forces of attraction are the force of attraction takes place between two molecules.
Q: a net ionic equation best
A:
Q: CHEMWORK Hexamethylenediamine (C6H16N2) is one of the starting materials for the production of nylon...
A: First we find the mole of reactant and then Theortical yield to find percent yield
Q: Suppose a 250. mL flask is filled with 1.0 mol of Cl, and 1.8 mol of HCl. The following reaction bec...
A:
Q: What is the entropy change of the reaction below at 298 Kand 1 atm pressure? 4Al(s) + 30 2(9) 2AI 20...
A: THE ENTROPY CHANGE OF A CHEMICAL REACTION IS CALCULATED AS DIFFERENCE BETWEEN THE SUM OF ENTROPIES O...
Q: Gaseous ammonia chemically reacts with oxygen gas to produce nitrogen monoxide gas and water vapor. ...
A: Here we have use mole concept , first we write balanced chemical equation and do the stoichiometric ...
Q: Carbon -14 has a half-life of 5.730 x 10 3 years. If the original mass of the parent is 501.695 g, ...
A:
Q: Define each stereocenter as either (R) or (S). If the molecule does not have a stereocenter select "...
A: Assign priorities to the groups attached to the chiral centre as per CIP rule(Cahn-Ingold-Prelog) If...
Q: Predict the two major organic products from the following reaction. (Select all apply, Points will b...
A: This reaction is electrophilic aromatic substitution reaction in which benzene ring acts as nucleoph...
Q: Mg + O2 -> MgO Mg = Mg = %D O = %3D
A:
Q: How many grams of K2CrOa are found in a sample containing 0.094 moles of this compound?
A: The no. of moles and weight of the compound are related as Moles = weight(in grams) / molecular weig...
Q: AH° for
A:
Q: EXAMPLE 2 FOR THE D STATE OF THE ELECTRON CALCULATE THE 5/2 POSSIBLE VALUES OF J AND THE DIFFRENT Po...
A:
Q: Balance
A:
Q: Calculate the pH of a 7.51 M solution of HBRO. The K, of HBRO is 2.50 x 10. Express your answer usin...
A:
Q: grams
A:
Q: Consider the imaginary element X. Which would you expect to have the largest radius and why? 1. X* 2...
A: ->when element loss electron then cation of element form.But protan are same.
Q: 2. Calculate the mass density of air at the surface of the Earth using the ideal gas law and assumin...
A:
Q: Explain why butter is solid in room temperature, while vegetable oil is liquid?
A: Fatty acids are the building blocks of fat in our bodies and in the food .
Q: 19. One reaction of iron with hydrochloric acid is represented by the following thermochemical equat...
A:
Q: in the synthesis of benzocaine: what is the structure of the precipitate that formed after the sulf...
A: Given:- what is the structure of the precipitate that formed after the sulfuric acid was added to th...
Q: A 43.9 mL solution of 0.827 mol L-1 HCl is titrated using 0.165 mol L-1 NaOH. What volume of NaOH (...
A: Given: Molarity of NaOH=0.165 M The volume of NaOH=V mL Millimoles of NaOH=Molarity x volume (mL)=0....
Q: sulfuric acid (H2SO4 d=1.83g/mL) aqueous solution having 5.8321 Molar Concentration with a density o...
A: Given-> Molarity = 5.8321 M density of solution= 1.33 gm/mole
Q: How much 0.5 M KOH must be added to 200 mL of 50 mM glycine at ph 8.6 to bring its ph to exactly 10....
A: Answer: Glycine is an amino that act as an buffer between the range of 8.6 to 10.6, therefore the pH...
Q: Balance
A:
Q: What is the percent yield of CO 2 if the reaction of 10.0 grams of CO with excess 02 produces 12.81 ...
A: Recall the given reaction, 2 CO (g) + O2 (g) 2 CO2 (g) 10.0 g of CO reacts wi...
Q: 37) In the United States, vision is tested by having the person attempt to read letters at a certain...
A:
Q: 1.) What are the oxidation states of the atoms in the following complex ions: (a) CO, (b) Cd(OH),, (...
A:
Q: Priya brought a solid chocolate bar to school to eat as a snack in the afternoon. She left it in her...
A: Anything which have mass and occupy space caller matter. Generally we study about three states of m...
Q: NaH H,SO4 (A) -OH (G) + ethyl chloride -OH (H) 180° K,Cr,0,, H,SO, (B) OH (1) + (J) •Product Set 1 (...
A:
Q: You are called in as a consult for a patient who suffers from acidosis. Urine levels of both lactic ...
A: The pateint has a defect of phosphatase enzyme. Phosphatase enzyme has function to active pyruvate d...
Q: O STOICHIOMETRY Theoretical yield of chemical reactions D 1/5 Liquid octane (CH; (CH,),CH;) reacts w...
A:
Q: From the given compound beiow, caicuiate the heat of reaction at costant pressure. C2H5OH CO2 + H2O
A: The reaction considered has ethanol as reactant and CO2 and H2O as products. It is required to calcu...
Q: The rate of a hypothetical reaction X-Y+Z. has the following data collected. time (s) (X) (M) 1.2000...
A: For a 2nd order reaction, 1/[A] vs time plot is a straight line and the integrated rate law equation...
Q: 9. If 44.0 g of O2 is mixed with 44.0 g of H2 and the mixture is ignited, what is the maximum mass o...
A: First we find mole of each reactant by using the formula:- Mole = mass÷ molar mass
Q: Rank the following ions in order of decreasing ionic radius (largest → smalle Na*. Mg²+, S²- 0²-, F¯...
A: Given - Na^+, Mg^+2, S^-2, O^-2 ,F^-
Q: Describe the relationship between each of the pairs of isomers shown by recording Constitutional, Co...
A: -> After flipping we get conformation isomer.
Q: solution that is 0.150 M chloroacetic acid and 0.250 M sodium chloroacetate, after the addition of 0...
A: Answer p oh = 10.2
Q: What advantages and disadvantages does water have as a recrystallization solvent?
A: Recrystallization is used to purify chemicals by dissolving both impurities and a compound is dissol...
Q: One solution contains 44% alcohol, and another solution contains 81% alcohol. How many liters of 81%...
A: Given One solution contains 44% alcohol, and another solution contains 81% alcohol. We need to find...
Q: Br Op, Con fig at Stereo ienten "enan HI R enuntomers Br S H Br Br H Br diustereomers Bri meso furm ...
A: Enantiomers - The two compounds which are non superimposable Mirror images of each other. Diastereo...
Q: The potential energy curve below is for two nuclei undergoing fusion. As the nuclei approach, the po...
A: Answer: Movement in the direction of attraction force decreases the potential energy and movement in...
Q: 6. Here we have the molecular orbital energy diagram for this chlorophyll molecule. Match the absorp...
A: λ(max) for the absorption is inversely proportional to the energy gap between the two levels.
Q: Question 7 The rate law of the overall reaction A+B -C is rate = k[A]2. Which of the following will ...
A: Generally Increasing the concentration and of one or more reactants and temperature will often incr...
Q: Which of the following reaction may have a different reaction mechanism compared to the others? a....
A: Addition reaction - combination of two or more reactant to form a product Elimination Reaction - re...
Q: Identify the criteria which compounds must meet in order to be considered aromatic. (Select all appl...
A: ->Aromatic compounds are most stable and antiaromatic compounds are least stable.
Q: (b) Calculate Kp using the partial pressures. Enter your answer in scientific notation. Kp = i x 10 ...
A: All the calculations are given below.
[C] *refer to the (2) photos below*
Step by step
Solved in 2 steps
- A piece of an unknown weighing 12.50is placed in 49.7cm of water in a cylinder. The water level increases to 69.0cm3. whats the calculated value for the drnsity of the solid in g ml-17. Consider a1Msolution ofNa3AsO4. Write the charge and mass balance equations for this system. (please type answer not write by hend)Calculate the time, in minutes, needed to plate 17.697 g of metal M at 43 Amps. The molar mass of metal M is 57.915 g/mol. M6+ + 6 e– → M Recall that, C = A*s, and Faraday’s constant, F, is 96,485 C/mole of electrons.
- 0.1724g of a mineral containing MnO₂ was dissolved and then treated with excess iodide according to the following unbalanced reaction: MnO2(s) + H+ → Mn²+ + I2 + H₂O The I₂ released was titrated with a solution of Na₂S2O3 0.07320 mol/L, requiring 14.65 mL to reach the point end of degree a) Determine the percentage of MnO₂ in the ore. b) When iodine solutions are used as titrants these are prepared by dissolving 1₂ in concentrated KI. Explain the reason for the need for KI in the preparation of these solutions?Pyrolusite (MnO2) is dissolved in hydrochloric acid:MnO2 + HCl → MnCl2 + H2O + Cl2The chloride was passed into potassium iodide solution where it liberated iodine:Cl2 + KI → KCl + I2The iodine liberated was estimated by adding sodium thiosulfate, the reaction beingI2 + Na2S2O3 → NaI + Na2S4O6If 5.6 g of crystallized sodium thiosulfate, Na2S2O3 5H2O ,were used up, how many grams of manganese were present?MW (g/mole): I =126.9; Mn =54.94; Cl = 35.45; K = 39.09; Na = 23; S = 32When a sample of the aqueous layer with a volume of 12.25 mL is collected, it requires 18.87 mL of a titrant solution of S2O32- with a concentration of 0.01617 M to reach the endpoint. The reaction has a 2:1 mole ratio of thiosulfate to all reducible iodine species. Calculate the concentration of total reducible iodine (in mol/L) in the aqueous layer. Include only the numerical answer (no units).
- A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCl and NaCl weighing 0.1801 g. These chlorides are dissolved in H2O, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K2O in the silicate.A solution containing 0.402 49 g of CoCl2 ? xH2O (a solid with an unknown number of waters of hydration) was exhaustively electrolyzed to deposit 0.099 37 g of metallic cobalt on a platinum cathode by the reaction Co21 1 2e2¡Co1s2. Calculate the number of moles of water per mole of cobalt in thereagent. A good approach is to find moles of Co, moles of CoCl2, mass of CoCl2, and, by difference, mass of H2O in the sample.For Redox Analysis of Iron... ~0.02 M of potassium dichromate is prepared as titrant for dried unknown. ~.3 g of sample, 50ml of 6M HCl, 20mL SnCl2, 10 mL of saturated HgCl2 solution, 60 mL of 3M H2SO4, 15mL of concentrated H3PO4, 100mL DI water. HCl (+ heat in fumehood until samples dissolves), SnCl2 (added with pipet until solution changes from yellow to colorless/light green with 3 drops in excess), HgCl2 (after cooling), H2SO4, H3PO4, DI Water, is added to the sample solution with 8 drops of diphenylamine sulfonate indicator then titrated with the potassium dichromate to a violet blue endpoint. 4. Why is it necessary to carry out the reduction of iron and then the titration, before going on to the next sample 5. If you look carefully, there are pieces of tin metal on the bottom of the SnCl2 reagent solution. Why is it there?
- For Redox Analysis of Iron... ~0.02 M of potassium dichromate is prepared as titrant for dried unknown. ~.3 g of sample, 50ml of 6M HCl, 20mL SnCl2, 10 mL of saturated HgCl2 solution, 60 mL of 3M H2SO4, 15mL of concentrated H3PO4, 100mL DI water. HCl (+ heat in fumehood until samples dissolves), SnCl2 (added with pipet until solution changes from yellow to colorless/light green with 3 drops in excess), HgCl2 (after cooling), H2SO4, H3PO4, DI Water, is added to the sample solution with 8 drops of diphenylamine sulfonate indicator then titrated with the potassium dichromate to a violet blue endpoint. 1. What is the purpose of the phosphoric acid in this experiment? Please be specific. 2. How does the Diphenylamine sulfonate indicator work? What chemical reaction causes the color change? How is an indicator chosen in a redox reaction?For Redox Analysis of Iron... ~0.02 M of potassium dichromate is prepared as titrant for dried unknown. ~.3 g of sample, 50ml of 6M HCl, 20mL SnCl2, 10 mL of saturated HgCl2 solution, 60 mL of 3M H2SO4, 15mL of concentrated H3PO4, 100mL DI water. HCl (+ heat in fumehood until samples dissolves), SnCl2 (added with pipet until solution changes from yellow to colorless/light green with 3 drops in excess), HgCl2 (after cooling), H2SO4, H3PO4, DI Water, is added to the sample solution with 8 drops of diphenylamine sulfonate indicator then titrated with the potassium dichromate to a violet blue endpoint. 3. How would you prepare a complete anlaysis procedure using KMnO4 as the oxidant instead of K2CrO7? Include sample and solution preparation, approximate weights of samples and reagents, procedure and chemical reactions. In particular what is the purpose of the Zimmerman Reinhardt Reagent?Many applications of electrochemistry have been in chemical analysis.Suppose a Fe|Fe2+ concentration cell is set-up in which the [Fe2+] = 1.0 x10¯2 M in one compartment but the concentration in the othercompartment is unknown. The Ecell was measured at 0.024V when thehalf-cells were connected.(i) Without doing a numerical calculation, is the unknown more orless concentrated than the 1.0 x 10¯2 M solution? Justify youranswer(ii) Calculate the unknown concentration.(iii) Does your calculated answer agree with your original answer?Why?