Does an hydroxide ion give a pH value of 7 or more?
YES, it is correct.
What is the concentration of the hydroxide ion given that the concentration of the hydronium ion is 1.5x10-5M?
Its all about energy levels. Individually, the acid and base have higher energy levels separate than when they are combined. When an acid and base react together, they form a salt and water. It is a more stable system with a salt and water than an acid and base. Second, acids want to give off their Hydrogen ion, and the base wants to give up its hydroxide ion. The hydrogen ion and hydroxide ion combine…
How do the concentrations of hydrogen ion and hydroxide ion determine whether a solution is acidic basic or neutral?
Acids have a higher concentration of the hydronium ion than the hydroxide ion. Bases have a higher concentration of the hydroxide ion than the hydronium ion. This is a consequence of the definition of pH. pH is equal to the -log([H3O+]), so as the concentration of the hydronium ion increases, the pH decreases. Lower pH = more acidic.