John was using sodium decyl sulfate as a surfactant at a concentration of 18 mM for reducing the surface tension of his system by about 25 dynes/cm. For cost reasons, he was told to replace sodium decyl sulfate with sodium dodecyl sulfate as the surfactant. Which of the following concentrations will give equivalent surface tension reduction using the sodium dodecyl sulfate in his formulation? 54 mM 6 mM 15 mM 2 mM
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- Missing molar conductivity Given: Conductivity: 281 us x cm^-1 (microseconds/cm) Concentration of solution: 0.05555555556 M (mol/lit) Basically, molar conductivity = conductivity/concentration, but what I'm not sure of is the proper unit for the answer molar conductivity and if it will require the given conductivity to be converted to seconds and meter (or not? I'm not sure cause i've been seeing S⋅m2⋅mol−1 in the internet as the unit for molar conductivity)The formula for 1000 g of polyethylene glycol ointment calls for 600 g polyethylene glycol 400. At $ 19.15 per pint, what is the cost of the polyethylene glycol 400, specific gravity 1.140 , needed to prepare 4000 g of ointment?In a solution containing 25ml (NH4)2S2O8 with a total volume = 100 ml =0.1 liters , the solution composition are shown below.Note; the solution require 25ml of 0.2M S2O8^-2.SOLUTION Kl KNO3 EDTA Na2S2O3 STARCH50ml 23ml 1 drop 1 ml 10 dropsExperiment; initial (S2O8-2) =0.05M ; INITIAL (l-)=0.10 Mml of S2O3^-2 added Time in minutes and seconds for color change Cumulative time in seconds Total moles of S2O8^-2 consumed1 1:43 2.0 x 10^-42 1:20 4.0 x 10^-43 1:13 6.0 x 10 ^-44 1.17 8.0 x 10 ^-45 1.24 10 x 10 ^-41a) Find the cumulative time in secondsb) for the runs ,plot mole of S2O8^2- REACTION vs. time in seconds2) Draw a straight line through ( origin ) the points and calculate the slope3) divide the value of the slope by the total volume of ( 0.1 L) to get the rate in units of M/s4) find the rate5 )calculate x and y and k
- In a 1:1 molar ratio of SDS (sodium dodecyl sulfate) - betaine (cocoamidopropyl betaine) system, the ratio of the surfactants at the air - liquid interface near the CMC will be: A - Richer in betaine and leaner in SDS B - same as in the bulk solution C-Both will show negative surface excess because of synergy in micelle formation D -Richer in SDS and leaner in betaineAn environmental study was performed to measure the transport of a DDT (a banned pesticide) throughout the globe. A lake in northern Canada was sampled to see if low levels of DDT were present there in spite of it not being administered within 1000 miles of that location. 1.000 L of the lake water was spiked with 100.0 uL of a 2.451 ug/L solution of tetrachlorobenzene, which acted as the internal standard. The entire 1.000 L spiked solution was concentrated onto an SPE column. After washing the SPE column with ~5 mL of pure water, the analyte and internal standard were eluted from the SPE column using ~5 mL of CH2Cl2 solvent. The eluted sample was evaporated under a stream of nitrogen to a final volume of 1.000 mL. 1 uL of this final solution was analyzed using GC-MS, and gave a signal of 24835 for DDT and 11597 for tetrachlorobenzene. To calculate the response factor, a standard solution was prepared consisting of 1.482 ug/L of DDT and 2.451 ug/L of tetrachlorobenzene.…Can elastic hose use for pumping and transferring concentrated solution of CH3COOH for long time? If not let explain why and propose at least two types of material which are properly used in this case.
- . The conductance of 0.00017 M acetic acid solution is 153 µS when applying a probe with 0.87 cm−1cell constant. The same probe measures 5.7 µS for the conductance of water. Calculate the conductivityand molar conductivity of the solution.solve as neatly as possible and show completesolution. Round your final answer to 4 decimal places and box / highlight all final answers. and all values must include proper units with proper conversion if needed in your solution. kindly folllow the format Given,Required,Solution 8. At 250C, the interfacial tension between water and n-octyl alcohol is 8.50 dyne/cm. If the surface tension of n-octyl is 27.53 dyne/cm and that of the water is 72.75 dyne/cm, predict whether water spreads on the alcohol by calculating a) Work of cohesion of n-octyl b) Work of adhesion and c) the spreading coefficient of water on the alcohol.A boiler burns fuel oil with 15% excess air. The fuel oil may be presented by C₁₄ H₃₀. Calculate the molal air fuel ratio. a. 14 b. 117.69 c. 102.34 d. 17.14 e. None of the choices
- In measuring the surface tension of a liquid (drop weight method), 20 drops of the liquid (r=0.2cm) falling apart from the tip whose diameter is 0.4cm were found to weigh 0.95 gram. What is he surface tension of the liquid? Show complete solution, and round the final answer up to 4 decimal places.How many grams of a 25% v/v hydroalcoholic solution should be used in preparing 32 fl.oz. of a 5% v/v solution. Specific gravity of the stock solution is 1.52.Why For ideal solution behavior, the molar Conductivity should be independent of solution concentration? Why the ODL can not be applied to determine Ka for strong electrolyte?