When carbon dioxide gas, CO2\text{CO}_2CO2, is bubbled through distilled water, a chemical reaction occurs to form an acidic solution.
Universal indicator added to this solution changes from green to yellow-orange.
State the formula of the ion responsible for making this solution acidic.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.