Answer: Option (C) is the correct answer.
Explanation:
When a mixture contains two or more components that are evenly mixed together in a solvent is known as a homogeneous solution. And, whenever there occurs unequal distribution of components of the solvent and solute then the resulting solution is known as heterogeneous solution.
For example, when and
are mixed together then there will occur hydrogen bonding between these two molecules.
But when NaCl and Hg are mixed then they will not combine with each other. Hence, the distribution will be uneven. So, the solution will not be homogeneous.
Similarly, LiF and ,
and
,
and
will also lead to the formation of heterogeneous solution.
Thus, we can conclude that out of the given options and
is the pair of substances that are most likely to form a homogeneous solution.
Answer:
Determine the pH of the solution half-way to the end-point on the pH titration curve for acetic acid.
Explanation:
The equation for the ionization of acetic acid is
HA + H₂O ⇌ H₃O⁺ + A⁻
For points between the starting and equivalence points, the pH is given by the Henderson-Hasselbalch equation:
At the half-way point, half of the HA has been converted to A⁻, so [HA] = [A⁻]. Then,
The pKₐ is the pH at the half-way point in the titration.
