Final answer:
A) Strong acid. Ba(OH)2 is a strong base because it disassociates completely in water to produce a high concentration of hydroxide ions.
Step-by-step explanation:
Ba(OH)2 is classified as a strong base. When dissolved in water, substances such as Ba(OH)2, which is a soluble ionic hydroxide, disassociate completely to yield a high concentration of hydroxide ions (OH-). This is a characteristic of strong bases, in contrast to weak bases that only provide a small proportion of hydroxide ions upon dissolution. According to the concept of conjugate pairs, a strong base like Ba(OH)2 forms a weak conjugate acid upon reacting with water. Meanwhile, for strong acids like HCl, upon their reaction with water, they produce a strong concentration of hydronium ions (H3O+) and have weak conjugate bases.
The compound Ba(OH)₂ is a strong base.
The compound Ba(OH)₂ contains the hydroxide ion (OH¯), which is a strong base. When Ba(OH)₂ dissolves in water, it dissociates completely to release OH¯ ions.
Other examples of strong bases include NaOH (sodium hydroxide), KOH (potassium hydroxide), and Ca(OH)₂ (calcium hydroxide).