Posted: 31/12/2016 at 19:32
Re this horrible slime problem, I've noticed that some people have tried sodium carbonate (also known as washing soda, soda ash or soda crystals) while others have tried sodium bicarbonate (baking soda and also an ingredient in baking powder and more commonly sold in powder form).
The two chemicals are similar but not interchangeable as they have different chemical formulas (sodium carbonate is Na2Ca3 while sodium bicarbonate is NaHCO3).
NB The bicarbonate used to be used as an anti-acid indigestion remedy (before a greater variety of tablets were designed for this job) whereas the carbonate form definitely can not be used in this way.
Although I am not a chemist I do know that each will react differently in each given circumstance. This should be considered before buying up a load of either chemical in case you get lumbered with the wrong one for your slime problem.
I would imagine the best way to tell which chemical suits your slime problem would be to do a test in 3 sets of flower pots - one set with sodium carbonate, a 2nd set with sodium bicarbonate and a 3rd set with neither - used as a control.
Keep them all separate, ie not touching, but in the same area as each other to create a 'fair test'. Each set should eventually give different results to enable you to see which chemical is most effective.