Recrystallization Post-Assignment

Suppose that you have a 1:1 mixture of compounds that is comprised of compound X and compound Y. You desire pure compound X and are planning a recrystallization to enhance the purity. Which solvent below is optimal for your recrystallization?      Ethanol (boiling point = 78 °C)   Solubility At   0  °C 100  °C Compound X 0.05 g/mL 0.20 g/mL Compound Y 0.02 g/mL 0.40 g/mL           Water (boiling point = 100 °C)   Solubility At   0  °C 100  °C Compound X 0.02 g/mL 0.05 g/mL Compound Y 0.01 g/mL 0.10 g/mL           Methanol (boiling point = 65 °C)   Solubility At   0  °C 65  °C Compound X 0.04 g/mL 0.10 g/mL Compound Y 0.02 g/mL 0.30 g/mL         Acetone (boiling point = 56 °C)   Solubility At   0  °C 56  °C Compound X 0.10 g/mL 0.50 g/mL Compound Y 0.20 g/mL 0.50 g/mL         Ethyl Acetate (boiling point = 77 °C)   Solubility At   0  °C 77  °C Compound X 0.10 g/mL 0.60 g/mL Compound Y 0.30 g/mL 0.60…

The alcohol content of hard liquor is normally given in terms of the “proof,” which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcohol present in 1.00 L of 75-proof gin. The density of ethanol is 0.798 g/mL. Round off to 4 sig. figures for all calculations made prior to final answer and the final answer should be in 3 sig. figures

Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?

A certain liquid X has a normal boiling point of 93.90 °℃ and a boiling point elevation constant K₁ = 1.14 °C-kg-mol¯¹. Calculate the boiling point of a solution made of 40.1g of zinc chloride (ZnCl₂) dissolved in 350. g of X. Round you answer to 4 significant digits. °C x10 X 1 Ś

A student wants to determine how different factors affect the rate of dissolving a solid in water. Trial Size of Particles Rate of Dissolving 1 small 10 sec medium 20 sec 3 large 30 sec What procedures can be performed on trials 2 and 3 so that the rate of dissolving is the same as trail 1? The student can decrease the temperature The student can decrease the pressure The student can increase the pressure The student can increase the temperature

5) Ethylene glycol is used as an antifreezing agent. Calculate the amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at -6.0° C? (The freezing point depression constant for water is 1.86°C kg solvent/mol solute.) Show your work.

NO₂ 4 5 NH₂ NH HNO3 Isopropanol, NaOH reflux, 12 h 6 NO₂

However, there are many other commercially purchased inorganic and organic compounds that people routinely used in their households (or in their everyday lives). A list of 19 chemicals with common names are written below. Find each of these items in your home or in a local grocery and take picture of the container (if you do not have access to all of them choose at least 12 of them) and then complete the table below. For #16 and 17 you choose any other house hold chemical and complete the table. • Inorganic compounds 1) table salt, 2) baking soda, 3) washing soda, 4) photographic fixer, 5) Epsom salt, 6) alum, 7) chalk, 8) corn starch, 9) sand, 10) active ingredient in toothpaste or cleansing agent and disinfectant, 11) decolorizing carbon Organic compounds Naming of organic compounds will be discussed in details in Lab 10 however there are still some simple organic compounds that you encounter at your home. Organic compounds are compounds that contain at least one carbon with one…

Solutes have almost no effect on the boiling & freezing points of a solvent.  True  False

Submit Previous Answers A solid mixture consists of 25.5 g of KNO (potassium nitrate) and 4.5 g of K2SO4 (potassium sulfate). The mixture is added to 130. g of water v Correct Use this solubility curve (Eigure 1) to answer the questions. Crystallization Crystallization is the opposite of dissolution. Since solids tend to dissolve better at higher temperatures, we can cause them to crystallize (i.e., undissolve) from a solution by lowering the temperature. Part B If the solution described in the introduction is cooled to 0 °C, what mass of KNO, should crystallize? Enter your answer numerically in grams. • View Available Hint(s) Figure < 1 of 1 29.65 KNO, / NH,CI Previous Answers Submit 50- Nac X Incorrect; Try Again; 6 attempts remaining 40 30 LiSO, Part C Complete previous part(s) 20 - K,SO, 10- Part D KCIO, 10 20 30 40 50 60 For which salt, K2SO,, LişSO,. KCIO,, or NH,C1, will increasing the temperature of the water have the greatest change in solubility per 100 g solvent?…

30 20 10 From the procedure 2. Assemble the simple distillation apparatus as generally shown in Figure SD.1 in the lab manual, ensuring that the thermometer bulb is aligned at, or slightly below, the Y in the distillation head. Each ground joint is greased by putting three or four stripes of grease lengthwise around the male joint and pressing the joint firmly into the other without twisting. 3. Attach a water condenser to the distillation head. 4. Remember, water goes in the bottom and out the top. Attach a clamp holder to the end of the drain tube to keep it weighted in the drain. Turn water to a trickle. If it is slowly draining, it is high enough. Begin a low flow of water through the condenser. 5. Place the set up on a heating/stir plate. 6. Turn on the hot plate to start heating the solution. Monitor the temperature and the boiling of the solution throughout the distillation process. 7. Record the temperature of the distillate when the first drops are recovered. 30.0 8. Adjust…

A 1.232-gram sample of copper complex weighed 0.783 g after heating. What is the percent of volatile material in this sample? If the sample contains 17.4% ammonia, what is the percent water in the sample?

The freezing point of water is 0.00°C at 1 atmosphere. A student dissolves 13.21 grams of sodium chloride, NaCl (58.40 g/mol), in 282.7 grams of water. Use the table of boiling and freezing point constants to answer the questions below. Solvent Formula Kb (°C/m) Kf (°C/m) Water H2O 0.512 1.86 Ethanol CH;CH2OH 1.22 1.99 Chloroform CHC13 3.67 Benzene C6H6 2.53 5.12 Diethyl ether CH3CH,OCH,CH3 2.02 The molality of the solution is m. The freezing point of the solution is °C.

ed The boiling point of water is 100.00 °C at 1 atmosphere. A student dissolves 12.63 grams of sodium sulfide, Na₂S (78.05 g/mol), in 163.3 grams of water. Use the table of boiling and freezing point constants to answer the questions below. Solvent Water Ethanol Chloroform Benzene Formula H₂O CH3CH₂OH CHCI 3 соно Diethyl ether CH3CH₂CH₂CH3 The molality of the solution is The boiling point of the solution is Kb (°C/m) Kf (°C/m) 0.512 1.86 1.22 1.99 3.67 2.53 2.02 m. °C. 5.12

What is the classification of each substance

When 184. mg of a certain molecular compound X are dissolved in 85. g of formamide (NH,COH ), the freezing point of the solution is measured to be 1.7 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits. Ox10 미

Part C: Determination of the alcohol content of unknown liquor Stretien Volume (mL) Sample ТИШТИНА 0.00% alcohol 10.0% alcohol 20.0% alcohol 40.0% alcohol 50.0% alcohol Unknown Mass (g) 1o podina ko 9.8919 9.7899 9.600 9 9.420 д % Alcohol content of the liquor 9.2155 9.5089 2VLELA CVOLION: MEAEK EVI OK DRA IVBOKY LOBAN ocen 10.00 10.00 10.00 10.00 10.00 10.00 Density (g/mL) 0.00% alcohol calculation: ися → о 0.99 во 0.99 To Z si doleW 120.00 supinubst sdi na LANG 411 bet [squardas: 0.97 0.94 in oil to notisalarisi 0.92 0.95

A certain liquid X has a normal freezing point of -2.10 °C and a freezing point depression constant -1 K₁=3.79 °C kg-mol . A solution is prepared by dissolving some zinc chloride (ZnCl₂) in 450. g of X. This solution freezes at -5.3 °C. Calculate the mass of ZnCl₂ that was dissolved. Round your answer to 2 significant digits. g x10 X Ś

A certain liquid X has a normal boiling point of 105.30 °C and a boiling point elevation constant K₁ = 1.74 °C-kg-mol¯¹. Calculate the boiling point of a solution made of 8.59g of ammonium chloride (NHCl) dissolved in 150. g of X. Round you answer to 5 significant digits. пос x10 X

A certain liquid X has a normal freezing point of -1.20 °C and a freezing point depression constant -1 K₁=5.73 °C kg-mol . A solution is prepared by dissolving some ammonium sulfate ((NH4), SO4) in 750. g of X. This solution freezes at -6.4 °C. Calculate the mass of (NH4) SO4 that was dissolved. Round your answer to 2 significant digits. g x10 X Ś

Substance Formula Acetone. lodine Biphenyl C₂H₂O 1₂ C₁₂H₁0 Structure (show all bonds, Aen, label P/NP) Predicted Polarity Solubility Experimentál Solubility Polarity