A membrane permeable only to K+ ions is used to separate the following two solutions. [KCI] = 0.18 M [NaCI] = 0.096 M [KCI] = 0.096 M [NaCI] = 0.18 M Calculate the membrane potential at 25.0°C. 40 0.0177 |× mv
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- Given that p*(H2O)=0.02308 atm and p(H2O)=0.02238 atm in a solution in which 0.122 kg of a nonvolatile solute (M=241 g/mol) is dissolved in 0.920 kg of water at 293 K, calculate the activity and activity coefficient of water in the solution.Calculate ionic strength and mean ionic activity coefficient of a 0.03 molal aqueous solution of sodium sulphate, Na2SO4.Imagine a hypothetical neuron that is only permeable to K+ ions. If the extracellular K+ concentration were 10 TIMES GREATER than the intracellular K+ concentration, then the resting membrane potential for this hypothetical cell at standard temperature (20 degrees Celsius) would be about: (given R = gas constant = 8.314472 J /mol· K, F = Faraday's constant = 9.65 x 10^4 C mol-1) a. 58 mV b. -58 mV c. 0 mV d. -90 mV
- Calculate the membrane potential caused by the different concentrations of an ionic element on either side of the membrane. Assume all ions are singly charged (z = 1). The concentration outside is 61 and that inside is 149 Give your answer in milliVolts (mV). Make sure you include the sign. The temperature T is 300k. You will need to look up the values of Boltmann's constant kB and the charge on the electron.Suppose the concentration of a solute varies along the length of a container according to c(x) = c0 - βc0x2, where c0 is the concentration at x = 0. Calculate the thermodynamic force on the solute at 25 °C and x = 8 cm and 16 cm given that the concentration falls to 1/2c0 when x = 15 cm. Hint: Start by finding the value of β.Given that p*(H2O) = 0.023 08 atm and p(H2O) = 0.022 39 atm in a solution in which 0.122 kg of a non-volatile solute (M = 241 g mol−1) is dissolved in 0.920 kg water at 293 K, calculate the activity and activity coefficient of water in the solution.
- Consider an ideal solution of ethyl bromide (EtBr) and ethyl iodide (Etl) with 38 mol% Etl at 318 K. How does the chemical potential of EtBr in solution compare to the chemical potential of pure EtBr? Your answer should include a mathematical expression and an explanation!5.0 grams of an unknown compound (non-electrolyte) was dissolved in 100 g of water. It was found to cause a 2 K change in the freezing point (kf = 1.86 K/m). What is the MW of the compound?The activity coefficient of KCl in water at 25 0 C is 0.901 when the concentration is 0.01.What is the electric work needed to charge the solution to this state?
- The mean activity coefficient of a 0.010 m H2SO4 solution is 0.544. What is its mean activity?The molar conductivity of a 1.5 M solution of an electrolyte is found to be 138.9 S cm2mol-1. Calculate the conductivity of the solution.The molar conductivities at infinite dilution of aqueous solutions of NH4Cl, NaCl, and NaOH are, respectively, 130, 108.6, and 216.5 S cm2 mol-1 at 18°C. The specific conductivity of a 0.01 M solution of ammonia at the same temperature is 9.6 x 10-5 [S cm-1] and the ion product of water is 0.59 x 1014. Determine: • The concentration of NH4+ ions in the ammonia solution. • The pH of the ammonia solution.