# Can NaOH and NaH2PO2 exist together in aqueous solution?

Can $$\ce{NaOH}$$ and $$\ce{NaH2PO2}$$ exist together in aqueous solution?

My textbook denies it, but I feel that since $$\ce{NaH2PO2}$$ is acidic, it should react with $$\ce{NaOH}$$, because in my textbook it is written that salts of even weak acids can react with a strong Base (e.g., $$\ce{NaHCO3}$$ is mentioned to react with $$\ce{NaOH}$$).

• $\ce{NaH2PO2}$ is not acidic and it is a common catch for less observant students. ( Or rather has extremely low, not mentioned acidity.), as the remaining hydrogens of hypophosphorous acid are bound directly to phosphorus.( $\ce{HO-PH2=O}$ ). Similarly, only 2 of 3 hydrogen atoms of phosphorous acid $\ce{H3PO3}$ are acidic. Jun 23 '20 at 13:38
• Neither of substances really exists in aqueous solution. They're both fairly dissociated into ions.
– Zhe
Jun 23 '20 at 16:09
• Can you give the title of your textbook, and paraphrase a few lines?
– Karl
Jun 23 '20 at 18:31
• @Karl , Its the study material provided by my coaching classes for IIT JEE prep. You won't really need to know the name. Jun 25 '20 at 17:13
• Well, I can only advise you to take everything coming out of the IIT-JEE complex with the utmost caution. Just my opinion, based on the purely anecdotal evidence of questions I have seen here on chem.SE.
– Karl
Jun 26 '20 at 19:29

Your question: Can $$\ce{NaOH}$$ and $$\ce{NaH2PO2}$$ exist together in aqueous solution?
I assume what you meant is your textbook is saying when two separate solutions of $$\ce{NaOH}$$ and $$\ce{NaH2PO2}$$ are combined, there should be no reaction. If that is what you meant "exist together," then your textbook is correct because there won't be an acid-base reaction since $$\ce{NaH2PO2}$$ has no "acidic hydrogen" contrast to $$\ce{NaH2PO4}$$ and $$\ce{Na2HPO4}$$ as Poutnik mentioned in his comment (more descriptive presentation would be $$\ce{Na^+^-OP(=O)H2}$$). The following diagram summerizes this point:
As diagram shows $$\ce{NaH2PO2}$$ (sodium hypophosphite) does not have any acidic protons to react with strong bases like $$\ce{NaOH}$$. The two hydrogens in $$\ce{NaH2PO2}$$ have attach ed to phosphorous atom in covalent bonds. And also showing is sodium bicarbonate, which has one acidic proton to react with $$\ce{NaOH}$$.