Sodium silicate and aluminum silicate are two different chemical compounds. Sodium silicate, also known as water glass, is a compound with the chemical formula Na2SiO3. It is a white or colorless solid that is soluble in water and is commonly used in the manufacture of glass, pottery, and detergents. Aluminum silicate, on the other hand, is a compound with the chemical formula Al2SiO5. It is a white or colorless solid that is insoluble in water and is commonly used in the manufacture of ceramics, pottery, and glass.