Question

which change would decrease the ph of a base in a solution at equilibrium? (1 point)

increasing the initial concentration of solute

increasing the strength of the base

decreasing the amount of water added to the solute

decreasing the concentration of oh⁻ ions

Explanation:

The pH of a solution is related to the concentration of hydrogen - ions ($H^+$) and hydroxide - ions ($OH^-$) in the solution. The relationship between pH and pOH is $pH + pOH=14$, and $pOH =-\log[OH^-]$. A lower pH means a more acidic solution. For a base, decreasing the concentration of $OH^-$ ions will decrease the pOH, and since $pH = 14 - pOH$, it will increase the pH (make the solution less basic/more acidic). Increasing the initial concentration of solute, increasing the strength of the base, or decreasing the amount of water (increasing the concentration of the base solution) will all make the solution more basic (increase the pH).

Answer:

D. decreasing the concentration of $OH^-$ ions