  The behavior of a neutral polyampholyte ($PA$) chain with $N$ monomers, in an
ionic solution, is analyzed in the framework of the full Debye-H$\ddot u
$ckel-Bjerrum-Flory $(DHBjF)$ theory. A $PA$ chain, that in addition to the
neutral monomers, also contains an equal number of positively and negatively
charged monomers, is dissolved in an ionic solution. For \underline{high}
concentrations of salt and at high temperatures, the $PA$ exists in an extended
state. As the temperature is decreased, the electrostatic energy becomes more
relevant and at a $T=T_{\theta}$ the system collapses into a dilute globular
state, or microelectrolyte. This state contains a concentration of salt higher
than the surrounding medium. As the temperature is decreased even further,
association between the monomers of the polymer and the ions of the salt
becomes relevant and there is a crossover from this globular state to a low
temperature extended state. For \underline{low} densities of salt, the system
is collapsed for almost all temperatures and exhibits a first-order phase
transition to an extended state at an unphysical low temperature.

Condensed Matter