The following cell was constructed to find the difference in Ksp between two naturally occurring forms of

Question:

The following cell was constructed to find the difference in Ksp between two naturally occurring forms of CaCO3(s), called calcite and aragonite.21
buffer(pH 7.00) ƒ CaCO3(s, aragonite) ƒ PbCO3(s) ƒ Pb(s)
Pb(s) ƒ PbCO3(s) ƒ CaCO3(s, calcite) ƒ buffer(pH 7.00)'