What is the meaning of 'the solution is seeded with freshly prepared samples of hydrated Al2O3'.? it is in page 150 of ncert under the heading leaching.
Seeding is a process in which a small quantity of material (crystal) is used to grow a large quantity of the same material (crystal).Basically it induces crystallization or precipitation.
When the leached solution hydrated Al2O3 is obtained, it is seeded with freshly prepared samples of hydrated Al2O3.This means a small quantity of freshly prepared Al2O3 is added to induce precipitation and obtain precipitated Al2O3.