55. is used for the qualitative analysis of elements nitrogen, sulphur and halogen in Organic compounds. In order to detect them, it is necessary to convert them into lonizable inorganic substances. Sodium Fusion Test O Aliphatic Test O Ignition Test
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A: This question belong to Chemical Equilibrium. We have solved this question by Unitary Mathod mole-mo...
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Q: 58. The structural formula given below is for HO O aspirin vanilla O glycerine
A: Structural formula represent the arrangement of atoms in a compound.Many organic compounds has pharm...
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A: Given, Heat of Vaporization of water, ∆Hvap = 40.66 kJ/mol Mass of water, m = 2.02 g
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Q: 23. A prussian blue precipitate of is an indication that Nitrogen is present. " Na4[Fe(CN)6] O Fe4[F...
A: Below attached file showing the details answer. All the best
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A: Given: Rate constant = 0.00409 M-1s-1. And the rate law of the reaction = K [C2H4Br2] [I- ]
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A: Given: pH of buffer = 4.65 pKa of acid = 4.57 Concentration of HB = 0.1 M Volume of HB solution = ...
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Q: Consider the reaction. 2 Fe,0, 4 Fe +302 AHixn +824.2 kJ The formation of 58.0 g of Fe results in
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A: Given,
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- Using the percent purity calculations, determine the percent yield of synthesis of aspirin. Part I Synthesis of Aspirin Mass of salicylic acid used (g) 2.029g Volume of acetic anhydride used (mL) 5ml Mass of acetic anhydride used (vol. × 1.08 g/mL) 5.4g Mass of aspirin synthesized (g) 3.256g Part II Melting Temperature Data Melting temperature (°C) 133°C Part III Salicylic Acid Standard Stock Solution Initial mass of salicylic acid (g) 0.210g Moles of salicylic acid (mol) 0.0147 mol Initial molarity of salicylic acid (M) 0.724 M Part III Beer’s Law Data for Salicylic Acid Standard Solutions Trial Concentration (M) Absorbance Water (mL) 1 10 0.301 0 2 7.5 0.219 2.5 3 5.0 0.163 5.0 4 2.5 0.074 7.5 Best-fit line equation for the salicylic acid standards Test of the Purity of the Synthesized Aspirin Initial mass of aliquot of product (g)…use ion exchange method in analytical separation to separate mercury and nickel from polluted water using analytical steps and protocols.Chemistry In an analysis of the content of carbohydrate present in a glycoprotein, the following results were found: 12.6, 11.9, 13.0, 12.7 and 12.5 g of carbohydrate per 100 g of protein. Taking into account that σ is unknown, the confidence interval for the average value at a 90% confidence level of the carbohydrate content is: Select one:to. 12.5 ± 0.4b. 12.5 ± 0.2c. 12.5 ± 0.5d. 12.5 ± 0.3
- Based on a grade 11 chemistry student, answer the following question based on the provided tables: Part G: Final Identification of the Poison By this time, Tylenol has been pulled off the shelves at all of the stores in the area and a nationwide recall has been announced. Several suspicious capsules have been found and tested. The contents of the capsules contain a compound with a nitrogen content of greater than 15% and a carbon content of less than 50%. What is the poison in the capsule? Provide calculations to support your answer.You take a representative soil sample and determine the following data: Exchangeable cation cmolc/kg of soil Ca2+ 2.7 Mg2+ 1.0 K+ 0.1 H+ 1.0 Al3+ 2.8 Na+ 0.1 1) What is the CEC (cmolc/kg ) of this soil?In a sample digested with phosphoric acid, it was found that analysis of calcium reflects less sensitivity than when digestion is done with hydrochloric acid. Explain.
- Analytical chemistry is a particular field within the broader spectrum of the chemical sciences, in which many times the focus of analytical experiments is to develop new methods to analyze compounds, either structurally or by determining concentrations of compounds. One of the processes analytical chemists use to determine the exact concentration of a working solution is called standardization. In your own words, describe the differences between a primary, secondary, and tertiary standard, and describe the underlying concept behind the standardization process. Why is it done?2 CoCl2(aq) + 8 NH3(aq) + H2O2(aq) + 2 NH4Cl(aq) 2 [Co(NH3)5Cl]Cl2(s) + 2 H2O(l) In a 50-mL Erlenmeyer flask, cobalt(II) chloride hexahydrate (1.075 g), an aqueous solution of ammonia (1.2 mL, 15 M), ammonium chloride (0.505 g), and hydrogen peroxide (1.0 mL, 30.0% (w/w), density = 1.10 g/mL) were combined. After completion of the reaction, [Co(NH3)5Cl]Cl2 (0.450 g) was isolated. What was the percent yield of the product?To calculate the unknown concentration of a chemical in a solid sample, 4 different calibrationcurves were plot using 4 different methods. Which of the following method is considered asacceptable? a. Method 4, R? = 0.998b. Method 1, R2 = 0.650c. Method 2. R' = 0.890d. Method 3, R' = 0.169
- One way to determine the hardness of a water sample is to precipitate the calcium out of solution as a carbonate. The net ionic reaction for this precipitation is: Ca2+(aq) + CO32-(aq) → CaCO3 (s) A 1.00 L sample of water is drawn from a Phoenix, AZ well and 0.534 g of calcium carbonate is recovered using the above reaction. What was the Ca2+ concentration of the original water sample in ppm? Show your work and include units. Hint: ppm stands for parts per million, and in the case of an aqueous solution, this is equivalent to mg/L.5.00 mL of stock solution is diluted to 25.00 mL, producing solution ALPHA. 10.00 mL of solution ALPHA is diluted to 25.00 mL, resulting in solution BETA. 10.00 mL of solution BETA is then diluted to 25.00 mL, producing solution GAMMA. dilution factor for ALPHA from stock solution = 0.167 dilution factor for BETA from ALPHA solution = 0.0476 part c and d?How would each of the following errors affect the determination of the molar mass of the unknown (Increase/Decrease/No effect)? a. Thermometer reads 2.0o higher than the true temperature. b. Some of the t-butanol was unknowingly spilled after it had been weighed but before the solute was added. 3. A student accidentally added acetylsalicylic acid (MW = 180.157 g/mol) rather than salicylic acid (MW = 138.121 g/mol), if no other mistakes were made, how would this error affect the determined molal freezing point depression constant for t-butyl alcohol (Kf)? 4. Based on the Tf and Kf you determined for t-butyl alcohol, predict the freezing point of a t-butyl alcohol solution containing 0.530 m NaCl. Assume 1.9 is the van’t Hoff factor for NaCl in t-butyl alcohol. Show your work.