Question

the type of hardness that can be removed by boiling

Answer 1

Temporary hardness can be removed by boiling

Answer 2

Permanent hardness is that which cannot be removed by boiling. Temporary hardness is that which can be removed by boiling. When temporary hardness precipitates, most is attributable to calcium carbonate. Boiling such water causes the bicarbonate ion to become a carbonate ion, which then binds with calcium.