13344
Acidification of test water revealed that the Pb and Pb ( 2 + ) LC50 values were impacted by the pH manipulation method , with the following order of effects : HCl < CO2 < MOPS .
 Chemical: Pb; Chemical: Pb ( 2 + ); Chemical: HCl
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Pb, Pb ( 2 + ), HCl 
Answer:
 Chemical: Pb; Chemical: Pb ( 2 + ); Chemical: HCl