Why do salt pellets turn blue?
The blue color comes from an additive that keeps evaporated salt free flowing. Normally this food grade additive would appear colorless to yellow. When the substance comes in contact with iron sulfate or dissolved iron in some hard waters, it turns blue. Not all pellets contain this additive and thus do not change color.
Salt solutions have varying pH depending on the cation and anion composition of the salt. Some salts like NaCl are neutral. Both the cation and anion come from a strong alkali (NaOH) and a strong acid (HCl). Therefore, the blue litmus paper remains blue. However, other salt solutions are acidic and would turn blue litmus paper pink. Salt solutions can also be basic.
They have a bitter taste and they feel soapy. Bases are good conductors in solution, especially the stronger bases. Bases: -turn red litmus blue -turn universal indicator blue/purple -turn methyl orange yellow -turn phenolphthalein pink They also produce OH- in solution. Acid+ Base --> Salt + Water Base + Non-metal oxide --> Salt + Water Alkalis are soluble bases in water.