In the video the presenter very briefly mentions further purification of the final product. (a). Explain why a further purification is needed (Hint: Think about the analysis). (b). Identifying a suitable solvent, name a method for further purification of the final product.

English , i don't understand spanish.

Answerbonded to an amino group(nh2);

Firstly, the planetary model of the atom  failed  to explain why individual atoms produce discrete  line spectra. in fact, according to rutherford's model, each individual atom should produce a  continuous  line spectrum. the second flaw to his model was the fact that electrons orbit the nucleus in a circular fashion.