Daily Question 8.13
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1. Please hide your replies; editing after posting is ineffective! Delete directly without hiding! 2. Hiding method: http://bbs.hcbbs.com/thread-492556-1-1.html 3. 5 points for correct answers; there is a reward for everyone who participates. Fill-in-the-blank questions: 1. In the first three beds before the converter in the sulfuric acid plant, approximately ( ) of SO2 is converted into SO3. 2. The concentration of nicotinic acid refers to ( ). 1.95%. 2. The percentage of free sulfur trioxide in the total weight of nicotinic acid.
Reply to 1# A Shan: First of all. Occupying a sofa: 1. 93%–94% (this is an estimate); 2. The concentration of nicotinic acid is determined by the amount of sulfur trioxide present, for example, 20% fuming sulfuric acid means that 20% of its mass consists of sulfur trioxide.
Reply to 1# A Shan 1 (15). 2 (content of SO2).
1. 95% 2. Content of free sulfur trioxide
Reply 1# A Shan 20%, 100%
Reply 1# A Shan 99% 98%
Reply to 1# A Shie: 1. 92-95%; 2. SO3 content
Reply to 1# A Shan: 1. 90% 2. The mass percentage of sulfuric acid in the sulfuric acid solution
Reply to 1# A Shan: 1.95%. 2. The percentage of free sulfur trioxide in the total weight of nicotinic acid
Reply to 1# A Shan: No, I’ll learn it*
Reply to 1# A Shan 1: 95% 2. Greater than 98%