Amonoprotic weak acid, ha , dissociates in water according to the reaction ha(aq)↽−−⇀h+(aq)+a−(aq) the equilibrium concentrations of the reactants and products are [ha]=0.250 m , [h+]=2.00×10−4 m , and [a−]=2.00×10−4 m . calculate the value of pka for the acid ha .

of HA is 6.80

Explanation:

Acid dissociation constant () of HA is represented as-

Where species inside third bracket represents equilibrium concentrations

Now, plug in all the given equilibrium concentration into above equation-

So,

Hence

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.