Using the figure below, which equation can be used to calculate the equilibrium potential for Na*? Extracellular fluid Intracellular fluid Na* 15 mM Nat 150 mM K* 150 mM K* 5 mM ENa = 61 x log 150 ENa = 61 x log (5 + 150) ENa = 61 x log (150 ÷ 15) ENa = -61 x log (15 + 150)

Calculate K (both parts of the question)

A fluoride ISE immersed in 1 x 10•2 mol dm solution of sodium fluoride gives a potential of 35,2 mV and when it is immersed in a tooth paste solution it gives a potential of 30,2 mV. What is the concentration of fluoride ion in the toothpaste?

Cells use a concentration gradient of various ions to assist in normal biological events. Determine the Ecell if the intracellular concentration of K+ is 140 mM and the extracellular concentration of K+ is 4.0 mM. You may assume a temperature of 25°C. K+(aq) + e →K(s) E° = -2.92 V 3.01 V 0.091 V -0.086 V 0.086 V -0.091 V

how to calculate the equilibrium constant given Delta Grxn= +6.4kJ/mol at 298K

A concentration cell is constructed having Zn elelctrodes in two ZnSO4 solutions A and B. At 25°C, the osmotic pressure of the two solutions are 56.3 atm and 0.563 atm, respectively. Calculate the Ecell, assuming no ion pair formation. Pi= iMRT