Write an overall equation for the acid-base reaction that would be required to produce the following salt. (NH4 )2 SO4

2NH₃(g) + H₂SO₄(g) → (NH₄)₂SO₄(s)

Explanation:

(NH₄)₂SO₄ → Ammonium sulfate

This salt comes from a weak base and a strong acid

Base → Ammonia

Acid → Sulfuric acid

The reaction is:

2NH₃(aq) + H₂SO₄(aq) → (NH₄)₂SO₄(aq)

This is an acid salt; the protons from the acid are gained by the weak base.

As sulfuric is a strong acid, the sulfate is the conjugate weak base (it has no reaction)

As ammonia is a weak base, the ammonium is the conjugate strong acid so in water, it can react as this: NH₄⁺ + H₂O ⇄ NH₃ + H₃O⁺       Ka

Hydroniums are released, that's why it is an acid salt

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.