A solution of common salt in water is prepared by adding 50kg of salt to 200kg of water to make a liquid density of 1250kg/m3. Calculate the concentration of salt in this solution as a: i) Weight(w/w)fraction (Ans: weight fraction 20%)
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Q: Q3 / The solubility of sodium chloride NaCl in water at 290 Kis 35.8 kg / 100 kg of water. Express…
A: Molar mass of NaCl is 58.45 g/mol It is not 135.8
A solution of common salt in water is prepared by adding 50kg of salt to 200kg of water to
make a liquid density of 1250kg/m3. Calculate the concentration of salt in this solution as a:
i) Weight(w/w)fraction
(Ans: weight fraction 20%)
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- A tank, containing 1520 liters of liquid, has a brine solution entering at a constant rate of 3 liters per minute. The well-stirred solution leaves the tank at the same rate. The concentration within the tank is monitored and found to be c(t) = e(-t/800)/80 kg/L. Determine the amount of salt initially present within the tank. Initial amount of salt = ? kg. Determine the inflow concentration cin(t), where cin(t) denotes the concentration of salt in the brine solution flowing into the tank. cin(t) = ? kg/LThe aqueous solution of acetic with a flow rate of 1000 kg/hr contains 30% acetic acid by mass and will be extracted in a countercurrent multistage process with pure isopropyl ether (IPE) to reduce the acetic acid concentration in the final raffinate phase (LN) to 2% by mass. a) Calculate the minimum solvent flow. b) Determine the theoretical number of steps required when using a solvent of 1.5 minimum solvent flow rate. c) Determine the number of theoretical steps using the McCabe-Thiele method. Chart. Acetic acid (A)-Water (B)-isopropyl ether (IPE) (C) LIQUID-Liquid Balances at 1 atm pressure and 293 K Water layer (%) Water (B) Isopropyl ether layer (%) Water (B) 0.6 Acetic acid (A) IPE (C) Acetic acid (A) IPE (C) 98.8 1.2 99.4 99.3 98.9 0.69 98.1 1.2 0.18 0.5 1.41 97.1 1.5 0.37 0.7 2.89 95.5 1.6 0.79 98.4 91.7 1.9 1.0 97.1 6.42 13.30 25.50 36.70 1.9 93.3 4.82 11.40 2.3 84.4 71.1 3.4 3.9 84.7 71.5 21.60 31.10 58.9 4.4 6.9 58.1 48.7 10.6 10.8 45.1 37.1 44.30 46.40 16.5 36.20 15.1…Q3 / The solubility of sodium chloride NaCl in water at 290 Kis 35.8 kg / 100 kg of water. Express the solubility as the following: 1. Mass fraction and the mass percent of Naci 2. Mole fraction and mole percent of NaCl 3. kmol of NaCl per 1000 kg of water Note: molecular weight of NaCl = 135.8, and water = 18.016
- 50 mg of granular salt is briefly stirred into a glass container of 1/5 liter volume filled with water. After briefly mixing, some salt is still seen at the bottom of the class. The visible salt is filtered from the water, weighed and determined to have a mass of 20 mg. What is the dissolved phase concentration of salt remaining in the water? Provide your answer to the nearest whole number in units of mg/l.the dimensionless Henry's law constant for trichloroethylene at 25 degrees Celcius is 0.4. A sealed glass vial is prepared that has an air volume of 4ml overlying an aqueous volume of 36ml. TCE is added to the aqueous phase so that initially it has an aqueous-phase concentration of 100 ppb. After the system equilibrates, what will be the concentration (in units of microgram per liter) of TCE in the aqueous phaseAn 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.…
- A chart is prepared by plotting In Ksp versus 1/T, using data obtained by performing a lab experiment. Refer to the attached photo for reference on how to solve these equations. Particularly #5 should be useful: A linear fit of the data in the chart yields the equation y = (-5.0020x10^3)x+(2.100x10^1) with an R2 value of 0.9922. Determine the enthalpy (deltaH in kJ) associated with dissolving KNO3. Answer in scientific notation with appropriate sigfigs.A solution of potassium phosphate contains a mixture of 164 mg of monobasic potassium phosphate (MWt: 136) and 158 mg of dibasic potassium phosphate (MWt: 174) per milliliter. If a hyperalimentation fluid calls for the addition of 45 mEq of potassium, how many milliliters of the solution should be used to provide this level of potassium? How many millimoles of total phosphate will be represented in the calculated volume of potassium phosphate solution?A binary mixture with components A and B is to be separated in a distillation column to obtain 95 mol%. A as the top product. The binary mixture has a con stant relative volatility AB = 2. The column feed is a a - saturated liquid containing 50 mol % of A. Under the usual simplifying assumptions such as constant molal overflow, negligible heat loss, ideal trays, the mini mum reflux ratio for this separation is (rounded off to one decimal place)
- 125.1 mg of streptomycin sulphate are dissolved in 10 ml of water. A GC headspace analysis is carried out in order to determine the methanol content of the drug. A peak for methanol is produced which has 73.2% of the area of a peak for a methanol standard containing 0.532 mg/100 ml of methanol in water analysed under exactly the same conditions, What is the methanol content of the streptomycin sulphate in ppm and %w/w? Answer: 311.3 ppm, 0.3113 % w/w.how??A student prepared a solution by mixing two pure liquids with the same mass, chloroform (MW = 119.4 g/mol) and liquid A (MW = 65.3 g/mol). The total vapor pressure of the resulting solution was measured to be 12.69 kPa at 25oC. Given that the vapor pressure of pure chloroform at 25oC is 25.9 kPa, calculate the vapor pressure (in kPa) of pure liquid A at 25oC. (Assuming the mixture solution behaves ideally.) (Input your answer with 3 significant figures. No need to input any units.)A spent 1.0 percent caustic soda solution (ρNaOH = 8.42 lb/gal) with a volumetric flow rate of 3.0gpm is to be neutralized using either sulfuric acid or hydrochloric acid. First, determine the massflow rate (lb/day) of NaOH in the spent caustic soda solution, and then use that value todetermine the stoichiometric amounts (lb/day) of:1. H2SO4 required for neutralizing the OH− ions contributed by the spent caustic soda.[Hints: (1) write the balanced chemical equation for the acid-base reaction betweenNaOH and H2SO4, and use it to establish the stoichiometric weight ratio H2SO4 : NaOH.]2. HCl required for neutralizing the OH− ions contributed by the spent caustic soda. [Hints:(1) write the balanced chemical equation for the acid-base reaction between NaOH andHCl and use it to establish the stoichiometric weight ratio HCl : NaOH.]