I think I've found a small issue, correct me if I'm wrong or it has already been addressed.
The ~tsp amounts seem to be off for baking soda and chalk and calcium chloride. For example, for 10g baking soda, it's saying ~1.9tsp but my calculations say 2.3tsp.
For chalk it's saying 10g is ~2.6tsp but I think it's 5.6tsp.
For calcium chloride 10g is ~2.3tsp but I say it's 2.9tsp.