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- The mean activity coefficient in an 0.050 molKg-1 LaCl3 (aq) solutions is 0.303 at 25 o C. What is the percentage error in the value predicted by the debye – Huckel limiting law?A solution is prepared by dissolving 40.00 g of MgCl2 (f.w. = 95.211 g mol–1), a non-volatile solute, in enough water (m.w. = 18.02 g mol–1) to result in exactly 2 L of solution at 25 °C. Assume the density of the solution is that of pure water (dsolution = 1.000 g mL–1). The ebullioscopic constant (Kb) for water is 0.513 °C m–1. The cryoscopic constant (Kf) for water is 1.86 °C m–1. The vapor pressure of pure water is 0.0313 atm. Determine the freezing point of the solution.A solution is prepared by dissolving 40.00 g of MgCl2 (f.w. = 95.211 g mol–1), a non-volatile solute, in enough water (m.w. = 18.02 g mol–1) to result in exactly 2 L of solution at 25 °C. Assume the density of the solution is that of pure water (dsolution = 1.000 g mL–1). The ebullioscopic constant (Kb) for water is 0.513 °C m–1. The cryoscopic constant (Kf) for water is 1.86 °C m–1. The vapor pressure of pure water is 0.0313 atm. Determine the osmotic pressure in atm.
- Example: Calculation the weight of barium iodate Ba(IO3)2 if it dissolved in 500mL of distilled water (D.W) at 25 °C if M.wt of ppt = 487 g/mole and %3D Ksp= 1.57x10.The osmotic pressure of a solution of polystyrene in toluene (methylbenzene} was measured at 25 °C with the following results:c/(g dm-3) 2.042 6.613 9.521 12.602∏/Pa 58.3 188.2 270.8 354.6Determine the molar mass of the polymer.How many moles of solute particles are present in 1.64 mL of 0.458 M K2SO4? (the answer is 2.25E-3 but i would appreciate some insight on what steps to take!)
- Prepare 0.1N H2SO4 solution of 250ml volume. (Density of H2SO4 is 1.84 and purity is 98 %)The density of the solution prepared by dissolving 53.85 g of calcium chloride in 100 g of water at 18 C was measured as 1.3420 g/cm3. Calculate the mass fraction, mole fraction, molasses, molarity and normality of the dissolution.The distribution coefficient of hydrogen sulfide between benzene and water at 25 degrees Celsius is 5.9880. What is the minimum volume of benzene at 25 degrees Celsius necessary to extract in a single step 80% of the hydrogen sulfide from 1 liter of 0.15 molar aqueous solution of hydrogen sulfide?a.) 0.1336b.) 23.9520c.) 0.6680d.) 1.5030E.) none of the above
- . a-) What is the concentration of 250 mL of solution containing 0.125 grams of iron in ppm? b-) What volume of stock HCl is needed to prepare 0.3 M 200 mL HCl solution? (MW(HCl) =36,5 g/mole, d (HCl): 1,19 g/cm3 Weight Percentage (HCl) is 37% )Assuming the density of a dilute 10.0 mM solution of hydrogen peroxide (H2O2) is 1.00 g cm–3, determine the concentration of the H2O2 solution (a) as a %(w/w); (b) in ppm.The molar conductivities of 0.01 M solution of sodium chloride, potassium chloride and potassium sulfate are 126.5, 149.9 and 153.3 Scm² mol⁻¹ respectively. The molar conductivity for sodium sulfate is