Final answer:
Cu2+ produces a green flame, while Ba2+ produces a greenish-yellow flame. This can be observed through a flame test or by using a spectroscope to analyze the emission spectrum of each element.
Step-by-step explanation:
Both Cu2+ and Ba2+ ions produce a green flame when they are heated. However, there are ways to differentiate between them.
One method is to perform a flame test. When a sample of Cu2+ is heated, it produces a green flame. On the other hand, when a sample of Ba2+ is heated, it produces a greenish-yellow flame. The difference in color can be observed by comparing the flames side by side.
Another way to differentiate Cu2+ and Ba2+ is by using a spectroscope. A spectroscope is an instrument that separates light into its different wavelengths. Each element has a unique emission spectrum, which can be observed using a spectroscope. By analyzing the emission spectrum of Cu2+ and Ba2+, it is possible to identify the specific wavelengths of light that are emitted by each element and differentiate between them.