✔ 最佳答案
問題都好困難...
1.
Not sure, but not likely.
Although NaBr is a strong electrolyte (tends to dissociate completely) in water, at such a high concentration the ionic strength of the solution is high. Whether the activity of HCl would still be unity is in doubt.
2.
Likely, but depends on what you mean by "exactly".
If you mean they should be Exactly Identical, most likely not;
but it'll probably "be the same" in common sense, considering there is random error in preparation and measurement -- you cannot be 100% accurate when you're taking measurement.
Note that 0.1M HCl sol. is different from the 0.010M HCl sol..
3.
No way.
Even with secondary-level chem it's easy to note that pH of 0.05M H2SO4 sol. cannot be 1 .
H2SO4 ------> H(+) + HSO4(-)
HSO4(-) <======> H(+) + SO4(2-)
First ionization of sulfuric acid goes to completion (very large Ka), while ionization of bisulfate ion does not go to completion (~0.01 according to Wikipedia).
4.
Very... difficult...
First, it depends on do you want hydrogen-1 ion (proton) exclusively, but not D(+) ion.
Secondly, as you may have expected, there's exchange reaction:
HCl + D2O <======> DCl + HDO
or
HCl + D(+) <======> DCl + H(+)
The problem is, while isotopes usually have same (very similar) chemical properties, hydrogen is not quite so.
Since the mass of the atom is much higher (100% up), the bond strengths are greater, which could lead to more difficult cleavage of D-X bonds and possibly a smaller Ka value.
Not to mention the methods of measuring pH could react differently to deterium, say, glass electrodes and reduction potentials...
As difficult as measuring pH in non-aqueous solvents.
