▁acid ▁fire ▁ex ting u isher . ▁Am mon ium ▁hydro x ide ▁is ▁used ▁to ▁remove ▁gre ase ▁st ains ▁from ▁clothes ▁ ▁Ac id ity ▁of ▁bases ▁ ▁The ▁number ▁of ▁ion izable ▁hydro x ide ▁( OH -) ▁ ions ▁present ▁in ▁one ▁mole c ule ▁of ▁base ▁is ▁called ▁the ▁acid ity ▁of ▁bases . ▁On ▁the ▁basis ▁of ▁acid ity ▁bases ▁can ▁be ▁class ified ▁into ▁three ▁types : ▁mon o ac id ic , ▁dia cid ic ▁and ▁tri ac id ic . ▁ ▁Mon o ac id ic ▁bases ▁▁ ▁When ▁one ▁mole c ule ▁of ▁a ▁base ▁via ▁complete ▁ion ization ▁produces ▁one ▁hydro x ide ▁ion , ▁the ▁base ▁is ▁said ▁to ▁be ▁a ▁mon o ac id ic ▁base . ▁Ex amples ▁of ▁mon o ac id ic ▁bases ▁are : ▁ ▁S od ium ▁hydro x ide , ▁pot ass ium ▁hydro x ide , ▁silver ▁hydro x ide , ▁am mon ium ▁hydro x ide , ▁etc ▁ ▁D iac id ic ▁bases ▁ ▁When ▁one ▁mole c ule ▁of ▁base ▁via ▁complete ▁ion ization ▁produces ▁two ▁hydro x ide ▁ ions , ▁the ▁base ▁is ▁said ▁to ▁be ▁dia cid ic . ▁Ex amples ▁of ▁dia cid ic ▁bases ▁are : ▁ ▁B arium ▁hydro x ide , ▁mag nes ium ▁hydro x ide , ▁calci um ▁hydro x ide , ▁z inc ▁hydro x ide , ▁iron ( II ) ▁hydro x ide , ▁tin ( II ) ▁hydro