i gotchuuu i’m checking my answer now
        
             
        
        
        
Answer: 25 μg of calcium in a total volume of 57 mL to ppm is 0.4386ppm
Explanation:
Please see the attachments below
 
        
             
        
        
        
(1) CaCO3 is the correct answer.
The type of bond formed between Ca2+ and CO3 2- is ionic, and the type of bond formed between C and O is covalent.
Hope this helps~