Hydrochloric acid and sodium silicate reaction and observation.

Solutions of hydrochloric acid and sodium silicate are colorless and transparent. Acids react with salts of those acids that are weaker. Silicate is a salt of the weakest silicic acid, in the solubility table we see that it is insoluble. Therefore, when the solutions are drained, we will observe the precipitation of a gel-like precipitate of silicic acid.
2 HCl + Na2SiO3 = 2 NaCl + H2SiO3 (molecular)
2 H (+) +2 Cl (-) +2 Na (+) + SiO3 (2-) = 2 Na (+) + 2 Cl (-) + H2SiO3 (full ionic)
2 H (+) + SiO3 (2-) = H2SiO3 (abbreviated ionic)