Question

How does the pH value of 1M potassium hydroxide solution compare with that of 1M aqueous ammonia? Explain​

Answer 1

In neutral aqueous solutions at 25 °C, the [H30+] = [OH-] . If the solution is acidic such as vinegar (acetic acid in water), the [H3O+] > [OH-]. If the solution is basic such as lye (NaOH) in water, then the reverse is true. It is sometimes tricky for students to understand that as pH decreases, acidity increases and vice versa because pH = -log[H3O+].