Given the following list of ka values, determine which weak acid solution would have the highest concentration of [h+] (lowest ph value) at equilibrium assuming all acids have the same initial concentration.

a. hf(aq), ka = 6.3 × 10^−4
b. hc7h5o2(aq), ka = 6.4 × 10^−5
c. hn3(aq), ka = 1.9 × 10^−5

answer///carbon;

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.