Which quantity might correspond to the y-axis on this graph: [H+], pH, or [OH-]?<image 1>
['[H+]', 'pH', '[OH-]']
As we see, the concentration of hydrogen chloride grows linearly and is proportional to the 'y' axis. **HCl ** is a strong acid which means that it dissociates completely in water to produce the maximum number of H^+ ions. So the value on the 'y' axis is concentration of H^+ ions :