i want to ask u that which solution will change colour from pink to blue after blowing by the hair dryer??
- 9 years agoFavorite Answer
I think you may be in form 2
In f2 level, only hexahydrate cobalt(II) chloride paper(contain hexahydrate cobalt(II) chloride solution) will turn from pink to blue by dehydrating it
The use of hair dryer is dehydrating.Source(s): myself