can you check my work?

Give the conjugate acid for each of the following bases.
A. CN- = HCN
B. SeO4^2- = HSeO4-
C. HCO3- = H2CO

Wouldn't HCO3^- be H2CO3?

yes, it should have been, thank you i had missed writing that down.

Sure! I can check your work. Let's go through each base and find the conjugate acid for each one:

A. CN- = HCN
To find the conjugate acid for CN-, you need to add a hydrogen ion (H+) to it. So, the conjugate acid of CN- is HCN. You got this one correct!

B. SeO4^2- = HSeO4-
To find the conjugate acid for SeO4^2-, you also need to add a hydrogen ion (H+) to it. So, the conjugate acid of SeO4^2- is HSeO4-. You got this one correct as well!

C. HCO3- = H2CO3
To find the conjugate acid for HCO3-, you need to add a hydrogen ion (H+) to it. So, the conjugate acid of HCO3- is H2CO3. You got this one correct too!

Overall, your work is correct for all three bases. Good job!