Question

convert HCL to nascent CL

Answer 1

rather weak) form of aqua regia can be made by simply adding 
KNO3 to HCl, because of the following reaction:

HCl + KNO3 <-----> HNO3 + KCl

While this form of aqua regia *does* dissolve gold, the dissolution 
requires considerably more time to dissolve gold than "standard" 
aqua regia (HCl + HNO3) does.

I am guessing that this slower dissolution is caused by the low 
concentration of HNO3 in the mixture, since there is nothing to 
drive the above reaction to the right...

I am wondering, however, if the above reaction could be forced to 
the right by adding enough KCl to result in a solution that was 
saturated with KCl.  A solution that is saturated with KCl could
not dissolve any more KCl, so it would be as if KCl was insoluble
in the solution, which would drive the above reaction to the right.
This reaction would probably be slower than a "standard" precipitation