The mobile phase taken in the TLC jar can be one of the following O a solvent or mixture of solvents O a mixture of two inert gases O a mixture of a solid and a liquid O a mixture of gas and solvent
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- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. Will the aqueous layer be the upper layer or the lower layer? If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?please quickly ,within 1hour thanks ! If it takes longer than an hour, i don't need the answer (2) List the representative stationary phase for gas chromatography.After the liquid-liquid extraction of caffeine, you are removing the dichloromethane solvent on the rotary evaporator. After 30 mins the solvent volume has not decreased. This may be because: a. You have the aqueous layer on the rotary evaporator and are trying to remove water, instead of the organic layer b. You picked up the wrong solvent bottle, and this isn’t dichloromethane c. It typically takes 30 mins to remove the low-boiling dichloromethane solvent on a rotary evaporator d. You forget to close the vent on the rotary evaporator e. Either a), b), or d).
- which of the four binary mobile phase compositions (mixing ratio 1: 1) shown below will have the highest solvent strength ε ° on a normal phase hplc column? silica is used as a stationary phase. pentane + toluene methanol + acetone pentane + ethyl ethanoate propan-2-ol + ethyl ethanoate also need explaination why other options are incorrectThe density of the first fraction collected would be expected to be close to a value of ______. 1.00 g./mL 0.895 g/mL 0.789 mL 0.950 g.mL7. Would it work to take the melting point by using the same capillary tube for both trials? Solid melt(1) -solidify melt(2)-
- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. a. Will the aqueous layer be the upper layer or the lower layer? b. If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?What are the functions and procedure of analysis of many volatile organic molecules by using Gas chromatographyWhich properties would be ideal in selecting the compound to be used as a primary standard for quantitative volumetric analysis? HygroscopicVaporLiquidExpensiveSome PurityVolatileNot HydroscopicSolidStableLow Molecular Weight
- 1. The entire mercury bulb of the thermometer must be below the level of the side arm in order to obtain an accurate reading of the distillation temperature. Why is this so?2. Why is cold water circulated through the condenser from the bottom rather than from the top?4. In most distillations, the total volume of liquid obtained (distillate + residue) is not equal to the volume of the mixture introduced into the flask. What are the possible sources of loss in this procedure?Of Aspirin, ethanol, acetaminophen, ethyl acetate, hexane, and water which could go undetected during HPLC analysis, but could result in a lower than expected melting point, why are they not detected by HPLC analysis?Consider the following statements as they apply to gas chromatography. Decide if each is true or false. 1. ___ Temperature programming is necessary only for samples containing compounds with a narrow range of boiling points. 2. ___ GC carrier gases are generally inert gases like helium and nitrogen. 3. ___ The injection port temperature should be set at the average boiling point of all analytes. 4. ___ An FID is a mass-sensitive detector, not a concentration-sensitive device. 5. ___ An air peak is commonly used to determine the dead time when using an FID detector.