HCl + HNaCO3 -> NaCl +
H2CO3 <-> NaCl +
H2O + CO2
The reaction bubbles over because the
CO2 is released as a gas.
Adding additional sodium hydroxide should not
cause a precipitation, since NaOH is composed of
parts that are already in the system to begin
with. Unless you oversaturate the solution, you
should not precipitate anything.
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