Abstract This paper pointed out two errors in exercises of Chemistry 2 textbook(People's Education Press), the concentration of copper sulphate solution at normal temperature and pressure was impossible to achieve 2 mol/L, it was not possible to give students a tube of nitrogen dioxide. Experiment showed that a tube of nitrogen dioxide was upside down in the water, when the liquid level was basically stable, the water level rose to far more than 2/3 tube.
