Question

Which of the following is the value of hydroxyl ion concentration of pure water?

(a) 1×10^7 moles/litre

(b) 1×10^5 moles/litre

(c) 1×10^6 moles/litre

(d) 1×10^8 moles/litre

The question was asked during a job interview.

Asked question is from pH Measurement and Types topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

Answer 1

Correct option is (a) 1×10^7 moles/litre

Explanation: The hydroxyl ion concentration of pure water is 1×10^7 moles/litre. It can be represented as [OH-]=1×10^7 moles/litre.