When h ions are made, a substance becomes more acidic and the pH decreases.
The pH range on pH scale is form 0 to 14 while 7 is neutral.
If the value of pH is below 7 then the substance is termed as acidic and if the value is above 7 then it will be basic in nature.
An acidic substance gives off H+ ion when dissolved in water forming hydronium ions i.e. H3O+ ions thus decreasing the pH value.
More the concentration of hydronium ions or hydrogen ion in water more acidic the solution will be and vice versa.
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