Alkandionat is a carboxylic acid containing two carboxylate groups. 

Hydroxy carboxylic acids 
This class of compounds in addition to containing a carboxylic group - C = O - OH also contain hydroxyl groups (- OH). Thus these compounds can be as acidic as well as alcohol is. 

Based on the number of group - C = O - OH in these compounds are distinguished: 
a. Hydroxy acid monovalent 

This acid has only one group - C = O - OH 
b. Hydroxy acid bivalent 
These acids contain two groups - C = O - OH 
c. Hydroxy acids of trivalent 

This acid group containing 3 - C = O - OH.
 
 
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