Question

An aqueous solution twice alkaline as water. The pH of the solution is near to:

• A. 7.3
• B. 12
• C. 10
• D. 13

Answer 1

Answer: (A)

7.3

Since, the aqueous solution is twice alkaline as water, $\left[O{H}^{-}\right]=2\times {10}^{-7}$.
pOH $=-log\left[O{H}^{-}\right]=-log2\times {10}^{-7}=6.7$.
pH $=14-pOH=14-6.7=7.3$.