Method: acidbasetitration and colorimetric method of acid dye were used.
方法：采用容量法和酸性染料比色法。
2
The derivation of acidbasetitration error formula is a difficult point as well as an important point in teaching analytical chemistry.
酸碱滴定误差公式的推导是分析化学教学的一个难点，也是一个重点。
3
The first work of this paper is measuring physical properties of chitosan. Degree of deacetylation(DD)of chitosan determined by acidbasetitration is about 83%.