Answer:
a) K2[Ni(CN)4]
b) Na3[Ru(NH3)2(CO3)2]
c) Pt(NH3)2Cl2
Explanation:
Coordination compounds are named in accordance with IUPAC nomenclature.
According to this nomenclature, negative ligands end with the suffix ''ato'' while neutral ligands have no special ending.
The ions written outside the coordination sphere are counter ions. Given the names of the coordination compounds as written in the question, their formulas are provided above.
Answer is "an indicator".
Indicators change its color according to the pH of the solution. They shows different colors when the medium is basic and acidic.
Indicator pH range Acidic color Basic color
Methyl orange 3.1 - 4.4 red yellow
Phenolphthalein 8.2 - 10.0 colorless pink
Bromothymol blue 6.0 - 7.6 yellow blue