like to produce 1000 ppm of Na (synthetic water) I am using NaCl. similarly which salt would be used for HCO3.
USE NaHCO3
As Dr Srivastava said, you can use NaHCO3. But to my opinion, you should maintain the pH of the solution, otherwise, HCO3- can be converted into CO3=.
A suitable pH would be close to 8, or just over. Na or K salt of HCO3- should work just fine.
If you use de-ionised water to prepare the solution, then there is no need to worry about the pH
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