Question

what is the meaning of" ~ " this ​

Answer 1

Answer:

Sulfurous acid:

Sulfurous acid is a sulfur oxoacid. It is a conjugate acid of a hydrogensulfite. It is a tautomer of a sulfonic acid. The hydrogen sulfite, or bisulfite, ion is the ion HSO3-.

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Answer 2

Answer:

its not" ~ "this it's minus "-"