Question

What is the concentration of hydroxide ions in a solution with a pH of 5.24?

5.75 × 10-6
1.74 × 10-9
1.55 × 10-7
4.54 × 10-4

Answer 1

pOH=-lg[OH⁻]

pOH=14-pH

-lg[OH⁻]=14-pH

[OH⁻]=10^(pH-14)

[OH⁻]=10^(5.24-14)=1.7378×10⁻⁹ ≈1.74×10⁻⁹ mol/L

Answer 2

The concentration of hydroxide ions in a solution with a pH of 5.24 is
`1.74* 10^(-9) M`.

Step-by-step explanation:

The pH of the solution is defined as negative logarithm of
`H^+` ions in solution.

`pH=-\log[H^+]`

The pH of the solution = 5.24

Sum of pH and pOH is equal to 14.

`pH+pOH=14`

`pOH=14-pH=14-5.24=8.76`

`pOH=-\log[OH^-]`

`8,76=\log[OH^-]`

`[OH^-]=1.7378* 10^(-9)\approx=1.74* 10^(-9) M`

The concentration of hydroxide ions in a solution with a pH of 5.24 is
`1.74* 10^(-9) M`.