The ammonium iodide solution is converted into a buffer by the addition of ammonia (NH₃).
<h3>What is a buffer solution?</h3>
- A solution which is formed by the addition of weak acid and its conjugate base or weak base and its conjugate acid.
- They resist a change in pH of the solution when an acid or alkali added to them.
<h3>Which is to be added to the given solution to convert it into a buffer?</h3>
The given solution contains 0.21 M ammonium iodide (NH₄I). This is a salt of a weak base(NH₃) and a strong acid(HI).
NH₄I(s) → NH₃(g) + HI(g)
Where the salt is ionic. So, in aqueous solution it dissociates into NH₄⁺ and I⁻
The ammonium ion NH₄⁺ is the conjugate acid of the weak base NH₃.
So, the mixture of this weak base NH₃ and its conjugate acid NH₄⁺ converts the solution into a buffer.
Therefore, one liter of the given solution could be converted into a buffer by the addition of a weak base NH₃.
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