Hi, Its been a while since I was last here... Why I am back here is because I hope we still have someone here who can explain something form me. I tried to make sodium ethanoate by mixing backing soda and vinegar. About 80 g of first and 100 ml of 5 % vinegar. The experiment was looking OK, until I started to vaporize the water from it. Then the solution turned really viscose and sticky like glue. I would imagine that the baking soda was not pure sodium bicarbonate.