Soluble glass is water alkaline solution of silicates. It is a semi-translucent viscous-flow liquid of whity-grey or whity-green colour without any mechanic impurities that are visible with an unaided eye.
A silicate block is a solid glassy product got in the result of melting quartz sand and caustic ash or tartar salt. These components are added depending on what silicate (sodium or potassium) we need to get.
Silica sol is a colloidal solution consisting of a dispersive medium (water) and dispersive phase (micelles of amorphous silica).