Formic acid, hcooh, is a weak acid present in the venom of red-ants. at equilibrium, [hcooh] = 2.00 m, [hcoo− ] = 4.0 × 10− 1 m, and [h3o+ ] = 9.0 × 10− 4 m.

a. write the equilibrium expression for the ionization

See below  

Explanation:

The general formula for an equilibrium constant expression is

For this reaction,  

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l

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.