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1.What properties do the sulfa drugs have?
2.What are the deposite after the solution is neutealized to about pH 7 and the deposite when pH is 5?What is the insoluble substance in 10% hydrochloric acid? why?
3.During the reaction,if the alkalinity of reactant solution is too strong,the most sulfanilamide will be obtained;the second is sulfacetamide and the third is diacetylsulfanilamide;if the alkalinityis too weak,diacetylsulfanilamide will be the most,the second is sulfacetamide and the third is sulfanilamide.why?Give the explaination.

1、磺胺类药物有些什么性质？
2、当溶液中和到PH等于7时沉淀是什么？当PH等于5时，又是什么？
在10%的盐酸中，不溶解物是什么？为什么？
3、在反应中，如果反应物溶液的碱性太强，最多得到的是磺胺，第二是磺胺醋酰，第三是联乙醯磺胺；如果碱性太弱，得到最多的是联乙醯磺胺，第二是磺胺醋酰，第三是磺胺。为什么？给出解释。

the void soul, handles the senseless matter, superficial selfless fengxian, the substantive void helpless. probably crawls on the glass fly, front light, actually could not find the outlet