________ base gives less OH- ion when dissolved in water.

NH4OH (ammonium hydroxide) is a weak base, meaning it does not fully dissociate in water and therefore produces fewer OH- ions compared to strong bases. Strong bases like Ba(OH)2, NaOH, and even the slightly less soluble Ca(OH)2 dissociate more completely, releasing more OH- ions in solution. NH4OH's partial dissociation results in a lower concentration of hydroxide ions in water.