A student adds green copper(II) carbonate powder to an excess of dilute hydrochloric acid in a beaker. Which observation provides direct evidence that a soluble salt has been formed?
The temperature of the reaction mixture increases.
Effervescence is observed as a gas is released.
The green solid dissolves to form a blue-green solution.
The mixture turns universal indicator red.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 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.
