The dihydrated salt is blue-green.
A solution of barium chloride is added to a solution of potassium chromate, a yellow precipitate forms.
This depends on the metal; nickel chloride solution is green.
Cobalt (II) chloride dihydrated (purple colour) and with more water Cobalt (II) chloride hexahydrated (pink colour) .
No colour
CuCl2(s) = Cu^2_(aq) + + 2Cl^-(aq) In solution the chloride anions )Cl^-) are colourless ; see also dissolved common salt (NaCl) So it must be the copper cations (Cu^2+) that gives the colour blue.
Hydrated copper chloride in water is typically blue in color.
A potassium chloride (KCl) solution is colorless.
Copper chloride solution typically appears blue or green in color.
A solution of barium chloride is added to a solution of potassium chromate, a yellow precipitate forms.
Anhydrous cobalt chloride will absorb water and form hydrated cobalt chloride. This process is reversible, with the hydrated cobalt chloride releasing water vapor to revert back to anhydrous cobalt chloride when heated.
The final solution color will depend on the concentration of barium chloride and potassium chloride. However, in general, barium chloride is white and potassium chloride is colorless, so the final solution will likely appear white or colorless.
Potassium chloride dissolved in water typically appears as a clear or slightly cloudy solution with no distinct color.
Sodium Chloride solution has a pH of 7 & the Indicator color is green. Bromothymol blue indicator reflects a pH range of 3.5-9.5
The blue color of copper chloride solution is due to the presence of copper ions in the solution. When copper chloride dissolves in water, it forms copper ions (Cu2+), which absorb certain wavelengths of light and reflect blue light, giving the solution its characteristic color.
Anhydrous simply means 'without water'. The opposite is a hydrated substance, in which salt crystals contain water as an integral part of the crystal. For example, anhydrous cobalt(II) chloride, CoCl2, is a blue powder. Add water and you form cobalt(II) chloride hexahydrate, CoCl2.6H2O, which is a pink colour. Anhydrous cobalt chloride can be used to test for the presence of water because of this dramatic colour change. In addition, hydrated copper(II) sulfate, CuSO4.5H2O, forms bright blue crystals. Heating them drives off the water of crystallisation and anhydrous CuSO4, a grey/white powder, is formed. Adding water will reform a blue solution of the hydrated salt.
The color of a solution containing H2O and ZnCl2 would likely be clear or colorless. Both water and zinc chloride are transparent substances, so the solution would not exhibit a distinct color.
Solid Cobalt chloride crystals are pink when hydrated with water. If you heat the crystal, the water of crystallisation in the crystals will evaporate, leaving you with solid anhydrous cobalt chloride crystals which are blue in colour.