Chem. experiment help analyzing?

Question

when i added 12 M HCl to a saturated 5.4 M NaCl the solution bubbled and fizzed and a line of separation was formed. The question asked me what the Cl- concentration in the original solution and i think its 5.4 M that it asked after the addition of 12 M HCl and i think it 12+5.4 which is 17.4 M, than it asks me to explain in terms of the relative Cl concentration in the two solutions, and it terms of the equilibrium NaCl>< Na+Cl can someone help me analyze that question?

Answer 1

Data required.