why ammonium nitrate and sodium nitrate are used fo salt bridge?

Answer 1

Lancenigo di Villorba (TV), Italy

I AGREE PARTIALLY THE PREVIOUS ANSWER.

As GERVALDF wrote, you can enumerate several Nitrate Salts as Water-Soluble Compounds....
As GERVALDF reasoned, a Salt-Bridge as
NITRATE-BASED SYSTEM avoid you Undesired Precipitation or any other Chemical Interferences against Electrolytes.

On the other hand, GERVALDF thought not to Conduttometric Factors.
I remember you that KOLRAUSCH evaluated the LIMIT VALUE's ION-CONDUTTANCE for all the most common ions in its own solutions.
Starting from OSTWALD-ARRHENIUS's EQUATION, Kolrausch was able to determine the SINGULAR CONTRIBUTE OF ANY IONIC SPECIES when it is undergoing dilution in aqueous phase (e.g. at 25 °C).
In this manner, you may evaluate how much ANY ION BEHAVES AS ITS OWN NATURE, e.g. ANY ION MOVES IN AQUEOUS MEDIA BY MEANS OF ITS OWN FASHION.
Here below, I reported the interested values :

Nitrate Ion, e.g. NO3-...................71.4 [cm^2 / Ohm]
Potassium Ion, e.g. K+................73.5 [cm^2 / Ohm]
Ammonium Ion, e.g. NH4+..........73.4 [cm^2 / Ohm]
Sodium Ion, e.g. Na+...................50.0 [cm^2 / Ohm]

As you are able to see, Potassium and Ammonium Ions show Conduttance's Values MORE STRICT to Nitrate's One THAN Sodium does.
Thus, I suggest you NH4NO3 or KNO3 to put in Salt-Bridge instead many other Chemical Stuffs.

I hope this could be clear.

Answer 2

Ammonium Nitrate Salt

Answer 3

NO !!! you could no longer stability this . you start up with 2 thoughts of soluble compounds. once you combination them , the aptitude compounds are ammonium phosphate and sodium nitrate - the two one in each and every of that are soluble . for this reason no reaction has taken place . all you have is a answer of a mix of soluble ions . No reaction : If there is not any reaction you could no longer write any equation.

Answer 4

Because all nitrates are soluble. If you use KCl, you can get reactions forming insoluble chlorides in the salt bridge, like AgCl.