Question

As the 5 mL of saturated borax solution (already decanted at high slurry temperatures) cools to room temperature, solid borax may precipitate. It is not necessary to re-dissolve this precipitated solid before titration of the solution.

a) True
b) false

Answer 1

The answer is false; precipitated solid borax does not need to be redissolved before titration as the titration is concerned with the concentration of dissolved borate ions.

Step-by-step explanation:

In relation to the provided question about whether it is necessary to redissolve precipitated solid borax before titration after it has cooled and solid borax may have precipitated, the answer is false. It is not necessary to redissolve the precipitate because the titration measures the amount of borate ions in the solution, not the undissolved solids.

When performing a titration, one is generally interested in the concentration of the dissolved species in the solution, which reacts with the titrant. Considering that the solubility of solid borax decreases as the temperature drops, any borax that was initially in the solution at a higher temperature but falls out as a precipitate when it cools is excess and does not need to be considered in the titration.