1. A mixture of organic solvent (nitrobenzene) and water boils at 363K. The vapour pressure of water at 363K is 733mm. Calculate the weight percentage of the organic solvent in the distillate.
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- 7.A student carried out a fractional distillation of an unknown binary (2-component) mixture from a 50 mL pot solution. Based on the plot below, and assuming no azeotropes, what percent by volume was the solution in the lower boiling point component?Give detailed Solution..give answer both sub parts..I will give you upvoteA 18 g of unknown organic sample was dissolve in 756 mL of benzene. The boiling point of benzene was increased by 3.36oC. As the first step of analysis, determine the moecular weight of the unknow sample? Kb of benzene= 2.64oC/m Bb of benzene = 80.09 oC density of benzene = 0.874 g/mL at 25 °C Answer in whole number, no units required.
- STANDARDIZATION OF NAOH SOLUTION A 0.4047 g sample of primary standard grade potassium hydrogen phthalate (MM = 204.23) was dissolved in distilled H2O. The solution required 22.42 mL of the NaOH solution to reach the phenolphthalein end point. a.) Calculate the number of mmoles of KHP. b.) How many moles of NaOH will react with the KHP dissolved in water? c.) Calculate the molarity of the NaOH solution.The distribution coefficient of hydrogen sulfide between benzene and water at 25 degrees Celsius is 5.9880. What is the minimum volume of benzene at 25 degrees Celsius necessary to extract in a single step 80% of the hydrogen sulfide from 1 liter of 0.15 molar aqueous solution of hydrogen sulfide?a.) 0.1336b.) 23.9520c.) 0.6680d.) 1.5030E.) none of the aboveGRAVIMETRIC ANALYSIS The addition of dimethylglyoxime, H2C4H602N2, to a solution containing nickel(Il) ion gives rise to a precipitate: Nickel dimethylglyoxime is a bulky precipitate that is inconvenient to manipulate in amounts greater than 135 mg. The amount of nickel in a type of permanent-magnet alloy ranges between 22% and 38%. Calculate the sample size that should not be exceeded when analyzing these alloys for a nickel.
- List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillationPlease show complete solution12 g of unknown organic sample was dissolve in 706 mL of Dicloromethane (DCM). The boiling point of benzene was increased by 2.72oC. Determine the molecular weight of the unknown sample? Kb of DCM = 2.42oC/m Bb of benzene = 39.6 oC density of benzene = 1.33 g/mL at 25 °C Round your answer to the nearest whole number, no units required.
- 11. How much caffeine can be extracted using 50.0ml of DCM if a tea bag contains 15 grams of tea leaves with 0.9% of caffeine? And has undergone solid-liquid extraction with 100ml of distilled water followed by liquid-liquid extraction using DCM. The solubility of caffeine requires 15 ml of water and 2.0ml of DCM for 40.0mg. a 6.1 x 10^-5 b 6.0 x 10^-5 c 7.0 x 10^-5 d 7.1 x 10^-5A 0.2182g sample of NaCl was assayed by the Volhard Method using 50mL of 0.0985N AgNO3 and 11.75mL of 0.1340N NH4SCN. Calculate the %NaCl in the sampleCalculate the mass of naphthalene required to give a freezing point depression of 2.9°C when dissolved in the amount of cyclohexane specified in the procedure(15mL). For this prelab problem you should use the density of cyclohexane as being 0.7781 g/mL at room temperature.