What is the molarity of HCl in the stomach?

James Lingane in his text Electroanalytical Chemistry
(2nd Edition, Interscience Publishers, NY, 1958;
p.381) mentions how AgCl can be dissolved. If AgCl  is put
in a large concentration (> 0.2M) of HCl, it will produce
H+  and AgCl(2)-, which do not precipitate because
their solubility is appreciably greater than that of HCl
in pure water.

Best regards,

Matthew