This study aimed to develop and validate virtual tests based on three levels of chemical representation that can measure students’ understanding of salt hydrolysis. This study used development and validation methods, which consisted of 4 phases. First, the determination of the purpose and the scope of the test. Second, the development and design of the test Third. The validation, selection of items and scoring guidelines. Lastly, the assembly and evaluation of the test. The instruments used were a content validation sheet for experts to judge and an interview sheet for students. The participants were 11th grade senior high school students from three different schools in Karawang with 60 total respondents, and six of them were interviewed. The results showed that the virtual test containing 33 multiple choice items was valid with the Content Validity Index (CVI) value for macroscopic, submicroscopic, and symbolic level items being 1. The Virtual test was also reliable, with Cronbach’s alpha value for macroscopic, submicroscopic, and symbolic level items, respectively, being 0.605, 0.614 and 0.644. The results of this research can be used to measure students’ understanding of hydrolysis of salt based on three-level chemical representation.
 Keywords: virtual tests, chemical representation, salt hydrolysis
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