Assume you combined 20.0 mL 2.0 M Pb(NO3)2 and 400.0 mL of 0.10 M NH3. Assume that that the solid product fully precipitates and does not affect the pH of the solution above the solid. Calculate the theoretical pH of the resulting solution. Assume the total volume remains unchanged. How does your calculated value compare to the estimated pH of your reaction mixture

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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.