A bright-blue sample of is heated in a crucible until the solid turns white
CHEMISTRY · Single correct · CBSE · Chemistry · Acids, Bases and Salts · Acids, Bases and Salts
Problem
A bright-blue sample of CuSO4⋅5H2O is heated in a crucible until the solid turns white. Which additional step would best allow a student to determine whether the heating produced a chemical or a physical change?
(a) Measure the mass of the solid before and after heating to determine whether any mass was lost.
(b) Test the pH of an aqueous solution of the solid before and after heating.
(c) Add a few drops of water to the cooled solid and observe whether the original blue color returns.
(d) Determine the melting point of the solid before and after heating.