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