17505
The sample is then immersed in aqueous solution containing hydrogen fluoride ( HF ) , which serves as the reactive liquid .
 Chemical: hydrogen fluoride; Chemical: HF
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: hydrogen fluoride; Chemical: HF