今有已放置5年的阿司匹林原料,欲测其含量,精密称取0.3256g,加中性乙醇20mL使阿司匹林溶解,加酚酞指示液2滴,滴加 NaOH 液(0.1032mol/L)至溶液显粉红色,再精密加 NaOH 液(0.1032mol/L)40.00mL,置水浴上加热15分钟,迅速放室温,用 H 2 SO 4 (0.05000mol/L) 滴定,消耗 H 2 SO 4 液23.45mL,求本阿司匹林含量( )?
【简答题】S1:What's wrong with your radar?S2:The radar has fused again and again.Q:What's the problem?A. The radar has no reflection. B. The radar cannot reach distant targets. C. The radar has no range marker ...