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阅读以下文字,回答 1~5 题 《中国药典》收载 “ 阿司匹林 ” 的正文内容部分如下: “ 本品为 2- (乙酰氧基)苯甲酸,按干燥品计算,含 C9H8O4 不得少于 99.5% 。 【鉴别】( 3 )本品的红外光吸收图谱应与对照的图谱(光谱集 5 图)一致。 【检查】 游离水杨酸 ...... 照高效液相色谱法(通则 0512 )试验, ...... 按外标法以峰面积计算,不得过 0.1% 。 【含量测定】 取本品约 0.4g ,精密称定,加中性乙醇(对酚酞指示液显中性) 20ml 溶解后,加酚酞指示液 3 滴,用氢氧化钠滴定液( 0.1mol/L 滴定,每 1ml 氢氧化钠滴定液( 0.1mol/L )相当于 18.02mg 的 C9H8O4 ) ” 9. 按照 “ 含量测定 ” 的要求,以下哪一个称量数据是正确的A.
0.4023g
B.
0.391g
C.
0.45g
D.
0.4g
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