A 50 ml aliquot of 0.05 M NaCN (Ka for HCN = 6.2* 10-10) is titrated with 0.1 M HCI. The reaction is CN + H, O* Calculate the PH after the addition of (a) zero ml (b) 10 ml (c) 25 ml (d) 26 ml of acid and draw the titration HEN +H,0 curve.​

answer; i do believe the correct answer is (river); /// good luck

the answer is 303.15 or 303

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.