The ksp of pbco3 at
25°c is 3 3x10
calculate its solubility in 0.01 moldm3 na2co3 at 30c

Agroup of engineering students from purdue university reported that its licking machine, modeled after a human tongue, took an average of 364 licks to get to the center of a tootsie pop. twenty of the group's volunteers assumed the licking challenge-unassisted by machinery-and averaged 252 licks each to the center.