Why Sc3+ is colourless in aquous solution whereas Ti3+ is coloured
Answer (1)
Student Expert
20th Jun, 2019
Hello student,
For Ti3+, metal ions usually form hexa coordinated complexes with water molecules. According to crystal field theory, Ti has outer shell electron which is free to jump between energy levels. Thus Ti3+ ions selectively absorbs certain colors which makes it colorful.
Sc3+ on the other hand has empty d orbital i.e. complex has no electron in t2g or eg orbital. Hence solution remains colorless in aqueous form.
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