The pKa of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.

The ratio of proton acceptor to proton donor is 1000

Explanation:

In a weak acid, the proton donor is HA and proton acceptor is A⁻. Using Henderson-Hasselbalch formula:

pH = pka + log₁₀ [A⁻] / [HA]

7,0 = 4,0 + log₁₀ [A⁻] / [HA]

3,0 = log₁₀ [A⁻] / [HA]

10³ = [A⁻] / [HA]

1000 = [A⁻] / [HA]

That means the ratio of proton acceptor to proton donor is 1000

I hope it helps!

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.

if you mean hydrogen and oxygen then water is the product