Yes, hydrobromic acid is soluble in water. In fact, it is highly soluble, meaning it can dissolve in a large amount of water. Hydrobromic acid is a strong acid, which means it completely dissociates into its ions when dissolved in water. The hydrogen ions (H+) and bromide ions (Br-) are then surrounded by water molecules, forming hydrated ions. This process is what makes hydrobromic acid soluble in water.