Hope you could understand.
If you have any query, feel free to ask.
Answer: the ability to be dissolved, especially in water.
Explanation: I think the answer you've picked is right
Hope this helps
Answer:
Titration
Explanation:
The best technique which can be used to determine the number of moles of the HCl in the sample is titration.
The given amount of HCl solution must be titrated with known concentration of the base like NaOH.
The volume of NaOH required must be noted also.
According to the reaction,

At equivalence point
Moles of
= Moles of 
Considering:-
Moles of 
Thus, in this way, moles of HCl can be determined.
What happens is that the sodium solution when put in water reacts and creates thermal energy .
It would decrease because they will be using less of their AC now that they've improved insulation.