[Orihime looks to Lavi.]

I do not know if there is a specific type of acid we need. Is there Lavi?

[She doesn't want to speculate on Izuku's awareness of Lavi's underlying purpose for all of this.]

Perhaps it would be better if you took these samples with you and tried them out for yourself? Even holding them would show their nature - that is, whether they will serve their purpose or not.