2. Calculate the volume needed (in uL) for making the following four standard solutions (10 mL each) from 1% (w/w; ~10 mg/mL) stock solutions of n-decane (C10), n-undecane (C11) and n- dodecane (C12) in hexane. n-decane (C10) n-undecane (C11) n-dodecane (C12)
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- 1. Why should the stopper always be removed from a separatory funnel whenever a liquid is being drained through the stopcock?2. The distribution coefficient, KD (ether/water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether? Calculate the weight of aspirin which would be removed by three extractions with 20 ml portions of water.How much 1.0 M sodium bicarbonate solution (in mL) is needed to stoichiometrically react with 25 mL of 4.5% (w/v) acetic acid? Molecular weight of sodium bicarbonate = 84.007 gmol, molecular weight of acetic acid = 60.052 g/mol please provide explanationAn organic compound has a distribution coefficient of 1.5 in methylene chloride and water. If 50 mg of this compound is dissolved in 15 mL of water, in which case will more of the compound be extracted into the methylene chloride: one extraction with 15 mL of methylene chloride or three extractions using 5 mL of methlene chloride each time? Show all work.
- 15 g of unknown organic sample was dissolve in 575 mL of Dicloromethane (DCM). The boiling point of benzene was increased by 3.40oC. 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 °Cpart 1 What is the % w/v of a 200ml solution containing 50g sucrose? part 2 What is the % w/v of a 2.5L solution containing 26.45g of SDS? part 3 How many grams of CaCl2 are required to produce 300 mls of a 10%w/v of CaCl2 solution.1) How many milliliters of 70% ethanol and 20% ethanol must be mixed to prepare 500ml of 30% ethanol? 2) A gaseous blend of nitric oxide and nitrogen (NOmax) contains 0.09% v/v nitric oxide (NO) and 99.92% v/v nitrogen. Express the strength of nitric oxide in PPM (round to whole number) 3) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500.Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).
- 10g coffee 4g sodium carbonate 40m dichloromethane 160ml distilled water coffee filter What are the principles behind caffeine being extracted from coffee using the above items? 1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and allowed to dry resulting in 30mg caffeine.Which of the following methods of preparing 0.0010M HCl solution from 1.0M stock HCl Solution willyield the smaller overlall uncertainty? a. A one step Dilution that uses 1mL(±0.006) pipet and 1000mL(±0.30) Volumetric Flask, or b. A two-step dilution that uses 20mL (±0.03) pipet and a 1000mL(±0.30) volumetric flask and a25 mL (±0.03) pipet and a 500mL(±0.20) volumetric flask for second dilution.12 g of compound “Y” dissolves in 10 ml of acetone at 25 0C and 0.85 g of the same compound dissolves in 10 ml of boiling acetone. If 5.0 g of compound “Y” were to be recrystallized from 75 ml acetone, what will be the next maximum amount of “Y” that will be recrystallized?
- If 5 teaspoonfuls of a 10% w/v povidone-iodine solution were diluted to 2 quarts with purified water, what would be the ratio strenght of the solution? (** Please show traditional method and not C1V1=C2V2 method**)Compound X has a distribution coefficient (K) of 5 for ether/water. If 5.0 g of compound X were dissolved in 500.0 mL of water, how many grams of compound X would be recovered from the water layer after two consecutive extractions using 50.0 mL portions of fresh ether from each extractionA 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.