Assertion: dilute sulfuric acid | /r/HasProperty | another sign
Facets:
Source sentences:
text: A solution of copper (II) sulfate can be electrolyzed with a copper cathode and platinum/graphite anode to give spongy copper at cathode and evolution of oxygen gas at anode, the solution diluted sulfuric acid that indicates completed reaction when it turns from blue to clear (production of hydrogen at cathode is another sign):