A cell with an internal calcium ion $(C{a}^{2+})$ concentration

of $20M$ is placed in media with a $C{a}^{2+}$ concentration

of $70mM.$ What is the difference in chemical potential

for $C{a}^{2+}$ ions between the inside and outside of the cell

at $310K?$ Please make sure you explain every step of the calculation and justify any assumptions you make. Please write clearly.