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From Rojas et al. [1] (emphasis mine):

On the other hand, we found that proton exchange with HB occurs in water with the estimated $\mathrm{p}K_\mathrm{a}$ of $3.5\pm 0.2,$ even after reactive sites for the hydrolysis reaction are terminated. Thus, for the practical application, one should keep in mind that HB sheets have a chemical stability against hydrolysis reaction, but become acidic in the presence of water

Does “acidic” here refer to the solution? Or acidic sheets that are gaining protons?

Reference

  1. Rojas, K. I. M.; Cuong, N. T.; Nishino, H.; Ishibiki, R.; Ito, S.; Miyauchi, M.; Fujimoto, Y.; Tominaka, S.; Okada, S.; Hosono, H.; Arboleda, N. B.; Kondo, T.; Morikawa, Y.; Hamada, I. Chemical Stability of Hydrogen Boride Nanosheets in Water. Commun. Mater. 2021, 2 (1), 1–8. DOI: 10.1038/s43246-021-00184-5. (Open Access)
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    $\begingroup$ Exactly what should be expected? Your hydride is an acid. $\endgroup$
    – Mithoron
    Commented Dec 6, 2022 at 12:26

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