The quantitative determination of N,H, with KIO, proceeds in a mixture of H,O/CCI, as follows N,H, + KIO, + 2HCI N, + KCI + ICI+3H,O 5. The end point for the titrimetric reaction is:
Q: 12. The half-life for the decay of the Uranlum (U)Isotope to the Lead (Pb)2 Isotope Is 4.5 x 10 year...
A:
Q: 50. What is the name of this compound 3HC-CH2-CH2-CH2-CH2-CH2- NH2? * 1-hexanamide 1-hexanamine hexa...
A:
Q: 2. The picture in the introduction shows that the mass of a crucible and lid was determined to be 22...
A: Given, The mass of Crucible and lid = 22.1504 g. The mass of crucible and lid and hydrate = 24.29...
Q: What is the vant Hoff factor if 0.15 m CrCl3 freezes at -0.91oC?
A: Van't Hoff Factor can be calculated as The number of ions observed in the solution/ total moles of ...
Q: Please fast solve the issue but don't copy 1-Butene and benzene as the only organic materials propos...
A: The synthesis of the following is:
Q: gas, oxygen (0,) gas and water vapor, releasing a great deal of energy. Calculate the moles of ammon...
A: For dealing such types of problems we have to write the proper balanced reaction. Now compare the st...
Q: 53. is another important ketone which is primarily used in the production of nylon." Cyclohexanone A...
A: Nylon is a polymer , it can be made using a ketone.
Q: Describe how to prepare 15 ml of a 0.25 M CaCl2 solution using deionized water and CaCl2 salt. The m...
A: Given :- Volume of solution = 15 mL = 15×10-3 L Molarity of CaCl2 = 0.25 M Molar mass of CaCl2 = 110...
Q: Which of the following scenes depict the process of an increase in the enthalpy? Stirring a coff...
A: a) When stirring a coffee mixture leads to increase in entropy due to increase in randomness in the ...
Q: 11111) Which of the following statements determine a reaction to be spontaneous? The ∆Hrxn is po...
A:
Q: heat ...
A:
Q: ch energy was released by
A:
Q: 5. A 6.00-g candle is consumed in heating 45.0 g of water from 19.0°C to 32.0°C. If you ignore loss ...
A:
Q: v Correct At 25 °C phosphoric acid, H3PO4, has the following equilibrium constants: Ka 7.5 × 10-3 Pa...
A: Given Concentration of K2HPO4 solution = 0.550 mol L-1Ka1 = 7.5 × 10-3Ka2 = 6.2 × 10-8Ka3 = 4.2 × 1...
Q: : Hydrogen and oxygen are reacted and the water formed is collected at 25°C, where it has a density ...
A: Given :- Mass of H2 = 36.8 g Mass of O2 = 168 g Density of water = 0.997 g/mL To calculate :- V...
Q: The CH3COOH could have greater vapor pressure lowering than NaOH. O True O False
A: Answer Lowering in vapour pressure is a colligative property Which is...
Q: A new monosaccharide has been discovered! OH 1 CH,OH OH OH Draw the disaccharide that would result f...
A:
Q: Given the following reactions: N2(g) + 2O2(g) → 2NO2(g) ΔH = 66.4 kJ ...
A:
Q: Explain what happens to a molecule when it is oxidized
A:
Q: 18. The reaction of the carboxylic acid with an alcohol and an acid catalyst leads to the formation ...
A: the process of combining an organic acid (RCOOH) with an alcohol (ROH) to form an ester (RCOOR) and ...
Q: For the reaction shown below, what is the relationship between the rate of formation of Br2 and the ...
A:
Q: O ATOMS, IONS AND MOLECULES 1/5 Predicting ionic compounds formed by two elements Decide whether eac...
A: We have find out the ionic compounds.
Q: Which of following mixture will be the BEST buffer at pH ~9? Mixing 10mL of 1M NH3 and 5mL of 1M KOH...
A:
Q: While they absorb moisture and generate heat, 12 g of Wool fibers were used to warm up 38 g of water...
A:
Q: 20. Using the data provided, solve for the enthalpy change value of the target equation. Note: Inclu...
A:
Q: Ammonium perchlorate (NH,CIO,) is the solid rocket fuel used by the U.S. Space Shuttle. It reacts wi...
A:
Q: Steam reforming of methane ( CH, ) produces "synthesis gas," a mixture of carbon monoxide gas and hy...
A:
Q: Which of the following is incorrect about entropy of a substance? O Slig > 0 Sgas = 0 O Sliquid > Ss...
A: Entropy: It is the measure of disorder/randomness of a system. Order of entropy: Gas> liquid >...
Q: 1. Explain the differences between M9SO4 (s), M9SO4 (aq), and MgSO4 • 7 H2O (s)-
A: It is often encountered as the heptahydrate sulfate mineral epsomite MgSO4·7H2O, commonly called Eps...
Q: Why is the boiling point of a liquid dependant on the atmospheric pressure?
A: Boiling is the process where liquid molecules transfer to vapor at the Boiling point.
Q: Decide whether each pair of elements in the table below will form an ionic compound. If they will, w...
A: An ionic compound is form by interaction of metal and non-metal a covalent compound is formed by sh...
Q: 1. [). 6 -C-C- -O- I C-C-C-
A: For name we have to select long chain and first protity will give to alcohol and then iodine
Q: 5.41 A sample of a smokestack emission was collected into a 1.25-1, tank at 752 mm Hg and analyzed. ...
A:
Q: Consider the dissolution of A2B: A2B(s) → 2A*(aq) + B´(aq). Using the information below, calculate f...
A:
Q: The picture beklow is a fruity flavor of ether ester amine
A:
Q: Determine AS for a gas undergoing the following conversion. Exactly 1.00 mole of an ideal gas at 298...
A:
Q: For a reaction that follows the general rate law, Rate = k[A][B]2, what will happen to the rate of r...
A:
Q: 9. A 250 ml flask containing 1.0 g of excess BN(s) is injected with 0.21 mol of Cl,g). 2 BN(s) + 3 C...
A:
Q: 15. Methylamine is a weak base with the formula, CH3NH2, the Kb for methylamine is 4.38 x 10-4 In a...
A: Methylamine is a Bronsted base, as it can accept a proton from water.Methylamine (CH3NH2) is conside...
Q: 8. For the following molecule, draw the monomers (3T) Hint there are three different monomers a. Wha...
A: Monomers are smallest unit from which polymer formed.
Q: Convert 2.12 lb/in^3 in mg/ml
A:
Q: What pressure is exerted by 129.5g of CH4 in a 0.3900 L steel container at 215.7k?
A: If a gas behaves like an ideal gas, it will follow the ideal gas equation. It gives the relationship...
Q: 5. Huge quantities of sulfur dioxide are produced from zinc sulfide by means of the following reacti...
A: Percentage yield of a reaction is defined as : % yield = (actual yield/theoretical yield) x 100%
Q: Draw product F. Select Draw Rings More F. (CHs),P-CH2
A:
Q: The following chromatogram is obtained for a mixture of substances X and Y. The retention factor for...
A: Retention factor: The ratio of distance traveled by the substance to the solvent is known as the ret...
Q: In a constant-pressure calorimeter, 65.0 mL of 0.800 M H,SO, was added to 65.0 ml. of 0.500 M NaOH. ...
A:
Q: Can you please type this out and not write it on paper, thank you
A: The answer is as follows:
Q: In a normal neuron, consider the following ionic concentration of cation X: Ion inside: 200mM Ion ...
A:
Q: Chloroform is an anesthetic. It is used to produce the refrigerant carbon tetrachloride according to...
A:
Q: Calculate the concentration of HCO3 in an aqueous solution of 0.0557 M carbonic acid, H2CO3 (aq). [H...
A:
Step by step
Solved in 2 steps
- To a 0.5 g sample of impure NaCl are added 0.784 g of pure AgNO3 (MW = 169.88) crystal. This is in excess of the amount required to ppt. All the Cl as AgCl. After dissolving and filtering out the pptd. AgCl, the filtrate requires 25.50 ml of 0.28M KCNS. What is the percentage of NaCl (MW=58.44) in the sample?a) What mass of Fe(NH4)2(SO4)2•2H2O(s) is required to prepare a 500 mL solution containing 100 ppm (m:v) in Fe? b) Using this stock solution, what aliquot must be used to prepare calibration solutions, 100 mL volume, of the following concentrations: 0.100 ppm, 0.500 ppm, 2.00 ppm, 4.00 ppm, and 7.00 ppm.3I- + OCl- + 2H+ ----> I3- + Cl- + H2: A 25.00 ml sample of liquid bleach was diluted to 1000 ml in a graduated flask. A 25 ml portion of the diluted sample was pipetted into an Erlenmeyer flask and treated with excess KI to oxidize OCl- to Cl- and I3- was produced at the end of the reaction. The released I3 was titrated with 0.09892 M Na2S2O3 and 8.96 ml was spent to reach the turning point besides the starch indicator. What is the percent by weight/volume of NaOCl in the bleach sample? (NaOCl:74.44 g/mol)
- 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?A first-stage recovery of magnesium from seawater is precipitationof Mg1OH22 with CaO:Mg2+(aq) + CaO(s) + H2O(l)---->Mg(OH)2(s) + Ca2+(aq) What mass of CaO, in grams, is needed to precipitate 1000lb of Mg(OH)2?The solubility of borax, which is made up of sodium tetraborate (Na2B4O5(OH)4 8H2O), was analyzed. The dissolution of borax is: Na2B4O5(OH)4 • 8H2O(s) ⇌ 2 Na+(aq) + B4O5(OH)42–(aq) + 8 H2O(l) A 50 mL saturated solution was prepared. After filtration of solution, 5 mL aliquot was transferred to a flask and titrated using 0.432 M HCl. The endpoint was found to be 4.73 mL of the titrant. Tetraborate anion (B4O5(OH)42-) is a weak base which reacts with HCl like the following reaction: B4O5(OH)42–(aq) + 2 H+(aq) + 3 H2O(l) ⇌ 4 H3BO3(aq) What is Ksp expression for the dissolution? What is the tetraborate ions concentration in the filtrate? What is the molar solubility and Ksp of borax if the titration was done at room temperature (298 K)?
- A 20 ml aliquot of malonic acid solution was treated with 10.0 ml of 0.25M Ce4+ leading to the reaction CH2(COOH)2 + 6Ce4+ + 2H2O ® HCOOH + 2CO2 + 6Ce3+ + 6H+ After standing for 10 minutes at 60oC, the solution was cooled and the x’ss Ce4+ was titrated with 0.1M Fe2+, requiring 14.4 ml to reach the ferroin end point. Calculate the M of the malonic in the sample.A sodium thiosulfate solution can be standardized by using it to titrate the iodine liberated by the action of excess KI on a known weight of primary standard K2Cr2O7: Cr2O72- + 6I- + 14H+ → 2 Cr3+ + 3I2 + 7H2O I2 + 2S2O32- → 2I- + S4O62- Calculate the molar concentration of the sodium thiosulfate solution if 31.47 mL of this solution were required to titrate a sample prepared using 0.2177 g pure K2Cr2O7.1. 1093-g sample of impure Na2CO3 was analyzed by residual precipitimetry. After adding 50.00 mL of 0.06911 M AgNO3, the sample was back-titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the endpoint. The percentage Na2CO3 (MW = 106.0 g/mole) in the tested sample is ________ % ? Note: Express final answer using least number of significant figures. 2. The alkalinity of natural waters is usually controlled by OH- (MW = 17.01 g/mole), CO3-2 (MW = 60.01 g/mole), and HCO3- (MW = 61.01 g/mole), which may be present singularly or in combination. Titrating a 10.0-mL sample to a phenolphthalein endpoint requires 38.12 mL of a 0.5812 M solution of HCl, and an additional 18.67 mL of the same titrant to reach the methyl orange endpoint. The composition of the sample is _________% CO3-2 and ___________ % OH- Note: Express final answers using least number of significant figures.
- A 0.1093-g sample of impure Na2CO3 was analyzed by the Volhard method. After adding 50.00 mL of 0.06911 M AgNO3, the sample was back-titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the endpoint. Report the purity of the Na2CO3 sample. [Ans. 90.9 % (w /w )]The amount of copper in a wire was determined by a redox titration using KMnO4 as the titrant. A 0.4185-g sample was dissolved in acid and the liberated Cu2+ quantitatively reduced to Cu+, using a reductor column. Titrating with 0.0250 M KMnO4 requires 41.27 mL to reach the endpoint. Determine the % w/w CuO in the sample of meteorite. Answer: % CuO =A 1.9300 g impure sample of Fe(NH4)2(SO4)2 (FW = 392.14) was dissolved in 75 mL 0.75 M H2SO4 and was titrated with the standard KMnO4 in problem 1. Titration of the sample required 24.00mL while the blank containing 75mL 0.75 M H2SO4 required 0.75 mL of the KMnO4 titrant. Calculate the concentration of Fe(NH4)2(SO4)2 in %w/w in the impure sample.