Writing inappropriate Chinese characters and mispronouncing are major problems of Chinese learners because of a great many homophones in Chinese language. However, we can also take advantage of the trouble.
This mapping of all syllables(1252, excl. 5th tones) - homophones(6763 GB2312 characters hidden behind the Pinyin cells) will help one to intuitively differentiate Chinese homonyms, and master them based on the relative few syllables easily.
For details please try the Chinese Character Bible, but the DEMO version doesn't transcribe all syllables and homonyms