One liter of a solution of pH 9 has how many more hydroxyl ions (OH⁻)than 1 L of a solution of pH 4?

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The pH scale is logarithmic, meaning each whole pH value below 7 (the neutral point) is ten times more acidic than the next higher value. For a solution of pH 9, it is basic, and we look at its pOH value to determine the concentration of OH⁻ ions. The pOH can be found by subtracting the pH from 14 (since pH + pOH = 14 in water). So, for a pH of 9, the pOH is 5, and for a pH of 4, the pOH is 10. This means the concentration of OH⁻ ions in the pH 9 solution is 10^5 times greater than in the pH 4 solution, because each unit change in pOH represents a tenfold change in ion concentration.

One Liter of a Solution of PH 9 Has How