Suggest a way to recognize substances: sodium phosphate, potassium bicarbonate, potassium silicate

Suggest a way to recognize substances: sodium phosphate, potassium bicarbonate, potassium silicate, sodium sulfite and potassium sulfate. Give the equations of the corresponding reactions and their signs.

Divide the contents of the tubes into 2 equal parts: Group 1 and Group 2.
Stage I – add hydrochloric acid (HCl) to Group 1:
1). Na3PO4 + HCl – nothing happens;
2). KHCO3 + HCl => KCl + H2O + CO2 ↑ (vigorous gas evolution, odorless);
3). K2SiO3 + 2HCl => 2KCl + H2SiO3 ↓ (gelatinous precipitate);
4). Na2SO3 + 2HCl => 2NaCl + H2O + SO2 ↑ (gas evolution with a pungent odor);
5). K2SO4 + HCl – nothing happens.

Stage II – add silver nitrate (AgNO3) to Group 2 (after removing the tubes with KHCO3, K2SiO3 and Na2SO3):
1). Na3PO4 + AgNO3 => 3NaNO3 + Ag3PO4 ↓ (yellow precipitate);
2). K2SO4 + AgNO3 => 2KNO3 + Ag2SO4 ↓ (white precipitate).