14901
Oil droplets loaded with surfactant propel themselves with a velocity up to 6 mm s ( - 1 ) when they are placed in an aqueous phase of NaOH solution or buffer solution .
 Chemical: NaOH
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: NaOH