I start my day by running mixed standards using a well established method. My compounds all elute earlier than expected, there two compounds have changed their elution order, what could be the cause (multi-select)? Higher % of organic than called for Lower % of organic than called for Stronger solvent used than method called for Weaker solvent used than called for
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- Suppose you have an organic sample X that is somewhat soluble in water, even though it issomewhat more soluble in dichloromethane or ether solvents. But if you do a singleextraction, you get only 60% of your material to transfer from the water to the organic layer.How many “washes” would it take to extract over 90% of your organic material extracted fromthe water layer?a) What percent of X can be extracted with 100 mL hexane? b) What will be the percent X remaining in water after extraction with four batches of 25 mL hexane? c) Using 100 mL water sample and portions of 25 mL hexane, determine the minimum number of extractions to obtain an efficiency of approximately 99 % Show solution and explanation.1. Which of the following may cause an increase in the calculated percent recovery of the recrystallized benzoic acid? a.Adding too much solvent in the receiving flask during hot filtrationb.Using cold water in rinsing the residue from the flask during hot filtration c.Using fluted filter paper during hot filtrationd.Not adding animal charcoal to the solution2. Which set of reagents can confirm that sulfate ions are present in two unkown solutions? a.1.0 M NaOH and excess NH3 b.0.1 M Ba(NO3)2 and 0.01 M KMnO4 c.1.0 M NaOH and 0.1 M K2Zn3[Fe(CN)6]2d.0.1 M Ba(NO3)2 and 1.0 M CH3COOH
- Please help The petition coeficiente between benzene and water for carta iLife is approximately 3.9 .you are given a 0.35 g sample of acetanilide dissolved in 100ml of water Which of the following extraction techniques will give q better recovery of.acetanilide from water A) one extraction with 60ml of benzene or b) two successive extractions with 30ml portions of benzene? Show calculationI just need help figuring out the values to do a calculation. Part of the lab relevant... "Prepare standards on the same day they will be used. Using a 100 mL volumetric flask, add x mL (vide infra) of the 0.050 mg/mL phosphate standard, 20 mL of th e molybdate-antimoney reagent, 1 mL of ascorbic acid, and dilute to volume with ultrapure water. Do this procedure for x = 0 mL, 1 ml, 2 ml, 5 ml, and 10 ml using volumetric pipettes. To be clear, we will be making 5 different solutions. The equation that was given was Concentration of initial standard (mg/mL) multiplied by volume added (mL) = concentration of created standard multiplied by volume of volumetric I dont need you to do the calculations, I just need help finding what values go in equation. we are trying to find the concentration of created standardA student was asked to identify the best recrystallization solvent for compound X. Below is the experimental data obtained. Which is the best solvent of choice? Observations: vs= very soluble; so=soluble; ss= slightly soluble; in = insoluble Test tube 1 2 3 Solvent A B C Hot water bath vs vs ss Room temperature so ss in Ice water bath so in in Group of answer choices None B C A
- Each of the student statements below is wrong. Explain why they are not correct. (a) All my compound dissolved right away in the small amount of solvent I added at room temperature, and I didn’t need to heat it at all. This means I’m going to get lots of pure compound out. (b) I did a recrystallization of naphthalene and my percent recovery was very high (99%), so I must have pure product. (c) When you’ve dissolved all your compound in hot solvent, and you’re in a hurry, it’s ok to just place it straight into the ice bath.Below is a chromatogram observed from chemical separation of chlorinated pesticides using gas chromatography. Water samples were pre-treated using solvent extraction technique prior to injection into GC. Complete the statements below so that the sentences will be accurate and logical. Gas chromatography coupled with __________ __________ detector is suitablefor chlorinated pesticide analysis. ii. Peaks that emerge first will represent compounds that are the most __________.Those compounds will also likely have low boiling points and show the leastinteractions with the stationary phase. iii. Major peaks start to emerge after 24 minutes. Heating the GC oven containing the column will likely __________ the time of chromatographic separation. iv. The peak height or area of an analyte is used to determine its __________ in quantitative analysis.Can you help me determine the required amount of 500mg ascorbic acid tablets to puverize the necessary amount of distilled water to make the desired concentration of stock solution (0.1M) Show complete and justifiable computations pls.
- When should we stop collecting distillate in ethanol-alcohol simple distillation process? Give me resources/links to validate the answer.The separation and purification processes given below and the method used against them are given. Which or which of these pairings are correct? I. Brewing of tea - ExtractionII. Purification of water impurities - ChromatographyIII. Separating olive pomace from olive oil while producing olive oil-DecantationIV.Petroleum fractions obtaining - Ordinary distillationV. Obtaining essential oils and using them in perfume making - Water-steam distillationA. I, II, III, IVB. I, II, III, IV, VC. I, IV, VD. I, II, III, VE. I, II, VThe separation and purification processes given below and the method used against them are given. Which or which of these pairings are correct? I. Brewing of tea - ExtractionII. Purification of water impurities - ChromatographyIII. Separation of olive pomace from olive oil while producing olive oil-DecantationIV.Petroleum fractions obtaining - Ordinary distillationV. Obtaining essential oils and using them in perfume making - Water-steam distillation