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In order to meet the development for all-English or bilingual teaching of basic chemistry in medical colleges of our country， we are now grouped to edit this book. The sequence of chapters and related contents in this book are consistent to the sixth edition of Basic Chemistry in Chinese which is published by Peoples Medical Publishing House as a NHOs programming book material. We have applied "three basic contents——basic theories， basic knowledge， basic skills" and "five features——thoughtful， scientific， advanced， heuristic， adaptable" to this book. That means precise demonstrations， clear arrangements， visual illuminations and fluent language. The whole book is arranged in a proper and gradual sequence to avoid destroying the coherence or connections of chapters and furthermore unnecessary repetition.
    In the present edition the first five chapters introduce concepts of solutions to the students， including colligative properties of solutions （Chapter 2）， electrolyte solutions （Chapter 3）， buffer solutions （Chapter 4）， and colloids （Chapter 5）. The next three chapters examine the factors that determine the speed and extent of chemical reactions： thermodynamics （Chapter 6）， kinetics （Chapter 7）， and electrochemistry （Chapter 8）. The next wo chapters deal with atomic structure （Chapter 9） and molecular structure （Chapter 10）. After a discussion of coordination compounds （Chapter 11）， the final chapters survey analytic  chemistry  of titrimetric  methods  （Chapter  12），  ultraviolet  visible spectrophotometry （Chapter 13）， and modern instrumental analysis （Chapter 14）.
    The essay at the end of chapters present is about interesting applications of basic chemistry relevant to the main chapter subject. Including topics from science， biological science， medicine， and day-to-day life， these applications enliven and reinforce the material presented in each chapter. We have made our efforts to make this book as effective， clear and readable as possible， to show the beauty and logic of basic chemistry; and to make the subject interesting to learn.
    The authors thank the editors of Huazhong University of Science and Technology Press， who have an excellent job of putting the final manuscript into book form; and most of all， the editor Zhangcheng Hu. Her encouragement， hard work， and advices made this book possible.
    inally， we express our indebtedness to our students who gave the reason for beginning， the courage to continue， and the fortitude to complete the project.
    We are sincerely grateful to them all.

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