[Frig man]

 I have a solution of 30% nh4oh ,and add 1% by weight  disodium chromate (na2cro4) will the vapor pressure of the ammonia  change for any particular temp or pressure  vs  the original 30% solution . My thought is  the vapor pressure of the ammonia will remain the same for both solutions ,if  the temps are equal. I believe  Dalton's law of partial pressure  is at  work here ,,, as long as there are equal masses of the ammonia present each of the solutions, the ammonia  should exhibit the same partial pressure...   and follow the temperature / pressure curve for ammonia.  Does this make sense ... or am I off course   Please comment

[Borek]

Raoult's law. Does the NH₃ concentration remain unchanged after you add other soubstance to solution?