题目某弱酸性药物在pH=7.0的溶液中90%解离,其pKa值约为A. 6B. 5C. 7D. 8E. 9某弱酸性药物在pH=7.0的溶液中90%解离,其pKa值约为A. 6B. 5C. 7D. 8E. 9题目解答答案A. 6