what about the Cl2 gas produced? its the only safety issue I see. heh...
The Na would react
Na2+ + 2e ---> Na + H20 ----> NaOH
but the Cl ion will
2Cl- ---> Cl2 + 2e
The Cl2 will need to go somewhere, but the NaOH would be made
using NaSO4 would result in some NaOH w/o any gas evolution.