In recrystallization, crystals gathered are washed with cold solvent. What would its effect on purity and recovery? provide a 2-4 sentences explanation for each effect
Q: Which one of the following could be a product of the reaction shown below? OH H* catalyst ??? HO. OH...
A:
Q: Consider the following reaction at equilibrium: 2NO₂(g) ⇌ N₂O₄(g) The ∆H° for this reaction is < 0. ...
A: We have to predict the direction of equilibrium.
Q: Calculate the cell potential for the following reactions and predict whether the reaction will take ...
A: Zn + 2 Ag+ (aq) ------> Zn2+ + 2Ag At anode ( oxidation) Zn -----> Zn+2 + 2 e- Eoxd = ...
Q: 3. Calculate the weight in grams of ethylene glycol (antifreeze) that would be needed for an automob...
A:
Q: line- angle structure of 5-chloro-1-ethylspiro[2.5]octane
A:
Q: The atmospheric surface pressure on Venus is 90 bar and is composed of 96% carbon dioxide and approx...
A: Given:- Pressure of Venus surface (P) = 90 bar Composition of CO2= 96% Composition of other gases = ...
Q: Br, Br CI
A:
Q: PART 1: Write the half - reaction of each redox reaction and determine the oxidizing and reducing ag...
A:
Q: III. PRACTICE EXERCISE 3. Answer the following questions in the provided space provided: 1. Which is...
A: The bond longer or shorter based on the bond length which is inturn dependent on the strength of the...
Q: Select the reactions below that are elementary reactions as written. Select all that apply. NO2(g) +...
A: Solution Given that 2 NO2(g) → NO3(g) + NO(g) Rate = K[NO2]² Hence option (C)...
Q: If a solid AB2 is added to water, and at equilibrium the concentration of A2+ is 6.23 x 10, what is ...
A: Solubility product is the parameter to understand the amount of solubility of a salt.
Q: Gaseous ammonia chemically reacts with oxygen (0,) gas to produce nitrogen monoxide gas and water va...
A:
Q: The rate of a certain reaction was studied at various T(K) k (s-1) temperatures. The table shows tem...
A:
Q: 1) Draw the structures corresponding the following names: A. trans-Cyclobutane-1,2-dicarboxylic acid...
A: A) Trans-cyclobutane-1,2-dicarboxylic acid- B) 4-Methylpenranoic acid -
Q: explain the results of this experiment table 2 Test Tube Number Cobalt Chloride Concentration...
A: The concentration v/s absorbance data given is, Test Tube Number Cobalt Chloride Concentrati...
Q: QUESTION 1 If 47.88 mL of distilled water at 90.2 °C is added to 47.93 mL of distilled water, in a c...
A: We have to predict the heat capacity of calorimeter.
Q: Name th
A:
Q: Each row of the table below describes an aqueous solution at about 25°C . Complete the table. That...
A: pH is negative logarithm of hydrogen ions
Q: 2. Name the following hydrocarbons using the IUPAC system: CH3(CH2)2CH3 СНЗСН2CI а. b. c. CH,CH=CHCC...
A: According to bartleby answering guideline we are supposed to answer only 3 subparts of the question ...
Q: P This dot structure represents which of the following answers: O P O (Ne] 3s^2 3p^3 O PA3+ O (Ne] 3...
A: In the lewis dot structure of an atom, the dots represent the valence electrons present in an atom.
Q: Methyl isocyanide, CH3NC, isomerizes when heated to give acetonitrile (methyl cyanide), CH3CN. C...
A:
Q: 9. Vanillin, the dominant flavoring in vanilla, contains C, H, and O. When 1.05 g of this substance ...
A: The empirical formula of vanillin is C8H8O3
Q: 0.4ml to minims
A: ml and minims are unit of Volume 1 ml = 16.2307 minims 0.4 ml =0.4 × 16.2307 minims0.4 ml =6.49228...
Q: In the laboratory, a general chemistry student measured the pH of a 0.429 M aqueous solution of form...
A:
Q: If 0.025 mol of COCl2 (g) is placed in a 1.0L container at 4000C, 16.0% of the COCl2 (g) is dissocia...
A:
Q: The hydroxide ion concentration, [OH-], of an aqueous solution of 0.429 M methylamine (a weak base w...
A: The base which does not dissociate completely in aqueous solution is called weak base. Using the kb ...
Q: need help finding and naming all the functional groups
A: Functional group in riboflavin and malonic acid.
Q: Please show complete answer. Propose a structure consistent with following set of spectral data: a...
A:
Q: How do you visualize stereochemistry? What kind of methods and tricks do you use to visualize these ...
A: Stereochemistry definition :
Q: 1) what is the concentration of the product after 1.00 min of the reaction 2) how long will it take ...
A:
Q: In the presence of excess thiocyanate ion, SCN-, the following reaction is first order in iron(III)...
A:
Q: Categorize each alcohol below as primary, secondary or tertiary OH H3C CH3 CH3 HO.
A:
Q: In relation to the attached image, select the correct alternatives: (I) It is an exothermic reaction...
A: Given reaction is : In relation to the attached image, select the correct alternatives : (I). It is...
Q: What may be the complications in doing nitrous acid test and how will it be resolved?
A: Nitric acid is an extremely corrosive acid capable of causing severe chemical burns very rapidly. If...
Q: A sample consisting of 2.00 mol He is expanded isothermally at 0° C fron 5.0 dm^3 to 20.0 dm^3 (i) r...
A: Reversible changes are infinitesimally small and values of energy , work done etc. are small. In con...
Q: . At 30.0 °C, pure benzene has a vapor pressure of 121.8 mmHg. Dissolving 15.0 g of a non- volatile ...
A:
Q: Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid wat...
A: Given that, Moles of glucose= 1.5 mol Moles of water ?
Q: e percentage of sulfur in the
A:
Q: 2. Name the following hydrocarbons using the IUPAC system: CH3(CH2)2CH3 СНЗСН2СI а. b. C. CH,CH=CHČC...
A: The IUPAC name of the above organic compounds are given below
Q: 1. Determine the normality of a solution which contains 2.83g of calcium sulfate in 500ml solution?
A: Normality: the number of gram equivalent moles of a solute present in one litre of the solution is c...
Q: Calculate the velocity of a neutron whose de Broglie wavelength is 500 pm. Search for the mass of a ...
A: given :- de Broglie wavelength = 500 pm to be calculated :- velocity of neutron
Q: Predict the products for the reaction following reaction: NaOH + Al2S3 --> Al
A:
Q: The Keq for the equilibrium below is 2.4 × 10-3 at 700 °C. SO2 (g) + ½ O2 (g) ⇌ SO3 (g) What is the ...
A:
Q: Practice Question: Outline all the necessary reactions with the minimum number of steps required to...
A: The answer is as follows:
Q: . Sodium carbonate is combined with calcium nitrate. a. Write the molecular, ionic equation, and net...
A:
Q: A 2.15 L volume of KOH of an unknown concentration is mixed with 2050 mL of 0.445 M NaOH. The result...
A: If same nature of two solutions are mixed with different concentrations and volumes then the resulta...
Q: a) (C2H5)2Be + Be(CH3)2 b) R2BH + R-CH=CH2 c) MgEt2 t-BUOH
A:
Q: e mass,
A:
Q: A mixture of 0.0080 mol of SO2 (g) and 0.0056 mol O2 (g) is placed in a 1.0 –liter container. When e...
A: Solution Given that SO2 (g) + O2 (g) ⇆ SO3 (g) SO2 = 0.0080 mol O2 ...
Q: The substance benzoic acid (C6H5COOH) is a weak acid (Ka = 6.3×10-5).What is the pH of a 0.258 M aqu...
A: 1) Given: Concentration of C6H5COOK = 0.258 M The hydrolysis reaction of C6H5COO- coming from C6H5CO...
Step by step
Solved in 2 steps
- Q1. Give three criteria for a good recrystallization solvent. Q2. You want to purify 10 grams of benzoic acid that has been contaminated with 0.2 g of salicylic acid. You are given the following data: Solubility in water at 20 °C Solubility at 100 °C (g/10 ml) Compound (g/10 ml) Benzoic Acid 0.029 0.680 Salicylic Acid 0.680 0.029 0.22 6.67 a) What volume of Boiling water is needed to dissolve the 10 g of benzoic acid? (show calculations) b) How much benzoic acid will crystallize after cooling to 20 °C (show calculations) c) Will any salicylic acid crystals form? Why or why not? (show calculations/ reason for answer) d) What is the maximum amount of benzoic acid that could be recovered in the first crop of this recrystallization? (Show calculations) e) How can you prove the purity and identity of the purified Benzoic acid?What are the differences between a simple distillation and steam distillation?Using recrystallization techniques, a student attempts to purify 0.50 g of compound H. Based on the solubility of H in the chosen solvent at collection temperature, the maximum percent recovery is 82%. The student obtains 0.396 g of purified crystals. What is their percent recovery? Group of answer choices 41% 64% 79% 82% 97% none of these
- What are the types of gravimetric methods? Give an examples where each method is used in an analysis. What is particulate gravimetry? When do we use this technique?Standardization of 0.10 M HCl1. Take three (3) clean and properly labeled 250-mL Erlenmeyer flasks. Into the three flasks, weigh 0.1 g of the primary standard Na2CO3 to the nearest 0.1 mg. Record the weights of the primary standard.2. Add about 75.0 mL of boiled distilled water and swirl to dissolve the solids.3. Add 2 to 3 drops of phenolphthalein indicator. Record the initial burette reading and titrate with the prepared 0.10 M HCl solution until phenolphthalein endpoint.4. Record the final burette reading for each titration in your data sheetDetermination of Ksp and Molar Solubility1. Add Ca(OH)2 to 250.0 mL distilled water with stirring until equilibrium is achieved. 2. Filter the undissolved precipitate. Measure out 50.0 mL of the supernate into a 250-mL Erlenmeyer flask using a pipette.3. Add a few drops of phenolphthalein indicator and titrate with standardized HCl solution until endpoint is achieved.4. Record the volume the HCl solution used. Perform two more trials.…Standardization of 0.10 M HCl1. Take three (3) clean and properly labeled 250-mL Erlenmeyer flasks. Into the three flasks, weigh 0.1 g of the primary standard Na2CO3 to the nearest 0.1 mg. Record the weights of the primary standard.2. Add about 75.0 mL of boiled distilled water and swirl to dissolve the solids.3. Add 2 to 3 drops of phenolphthalein indicator. Record the initial burette reading and titrate with the prepared 0.10 M HCl solution until phenolphthalein endpoint.4. Record the final burette reading for each titration in your data sheetDetermination of Ksp and Molar Solubility1. Add Ca(OH)2 to 250.0 mL distilled water with stirring until equilibrium is achieved. 2. Filter the undissolved precipitate. Measure out 50.0 mL of the supernate into a 250-mL Erlenmeyer flask using a pipette.3. Add a few drops of phenolphthalein indicator and titrate with standardized HCl solution until endpoint is achieved.4. Record the volume the HCl solution used. Perform two more trials.…
- You have 1000 μl of 1M NaCl stock solution (aq). How you would perform serial dilution to obtain 10-1, 10-2,…,10-5, 10-6M of NaCl solutions.You are analyzing the effluent from a lotion plant for parabens using HPLC. You have a working standard solution with a concentration of 59.4 ppm which returned a Peak Height of 10,164 and Peak Area of 5,315. You take 44.4 L of the water sample and concentrate it to 0.3 L and analyze this solution. The Peak Height is 9,119 and the Peak Area is 6,320. What is the concentration of parabens in the effluent of the plant in mg/L to two decimal places.What is another factor that can influence fractional distillation’s success other than the number of theoretical plates?
- Why is recrystallization not applicable to samples which contain large amount of impurities?Table 1. Solubility Tests. Functional Group Observations (specify type if any) Sample in concentrated (+/-) H2SO4 Color orange Hydroxyl group Hydroxyl group Hydroxyl group 1-butanol Color orange 2-butanol Color orange diisopropyl ether Look at the structures of compounds tested for solubility in concentrated H2SO4. What generalization can be made for a substance to be soluble in concentrated H2SO4 ?5.0 mL of 1-butanol was mixed with 10 mL of HCl. The reaction was put on an ice bath and 4 mL of concentrated sulfuric acid was added. This mixture was refluxed for 45 min and then the product was co-distilled with water using a simple distillation apparatus. Water and the product are immiscible. 1-butanol has a molar mass of 74.12 g/mol, a density of 0.810 g/mL, and a boiling point of 118 C. The product has a molar mass of 92.57 g/mol, a density of 0.880 g/mL, and a boiling point of 78 C. What is the nucleophile in this reaction? What is the role of H2SO4 in this reaction? Calculate the theoretical yield for this reaction. Give your answer in grams. Select the following statements that can be said about the reaction shown.