This task challenges the user to correctly choose and carry out the reaction between H₂S or Na₂S with Pb(NO₃)₂ solution to demonstrate the sulfide properties.
The correctness of reagents selection by the student is controlled by checking area present in the task
equipment: spawner, destroyer
glassware and items: erlenmeyer flask 250 ml,
solutions: H₂S 0.1M, Pb(NO₃)₂ 0.1M, Na₂S 0.1M, H₂SO₄ 2M
solids: -
checking zone label: "Results"