Question

A solution has a pH of 4.20. Using the relationship between pH and pOH, what is the concentration of OH?? A. 9.9 × 10-1 M B. 6.2 × 10-1 M C. 6.3 × 10-5 M D. 6.7 × 10-6 M E. 1.6 × 10-10M

Answer 1

E. 1.6 x 10 -10 M is the correct answer

Answer 2

The correct answer is option E.

Step-by-step explanation:

The pH of the solution is defined as negative logarithm of hydrogen ions concentration in a solution. Mathematically written as:

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

The pOH of the solution is defined as negative logarithm of hydroxide ions concentration in a solution. Mathematically written as:

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

The sum of ph and pOH is equal to 14.

pH + pOH = 14

A solution has a pH of 4.20.

`pOH=14-pH=14-4.20=9.8`

`pOH=9.8=-\log[OH^-]`

`[OH^-]=1.58* 10^(-10) M\approx 6.0* 10^(-10) M`

Hence, the correct answer is option E.