NH3, or ammonia, is colorless, like water.
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The color of Ni(NH3)6^2+ is violet.
Methyl orange is a suitable indicator for the titration of NH3 with HCl because the pH range for the color change of methyl orange (pH 3.1-4.4) corresponds well with the equivalence point of the reaction between NH3 and HCl (pH 4.74).
The scientific name for NH3 is ammonia.
NH3 is not an acid in water, but a weak base. In water, NH3 can accept a proton to form the ammonium ion (NH4+).
The addition of NH3 to a blue CuSO4 solution forms a complex ion called [Cu(NH3)4]2+ which has a deeper blue color. This complex ion results from the ammonia molecules replacing water molecules around the copper ion in the solution, causing a shift in color.