What is the pH of the NaOH solution when 0.04 g of it is dissolved in water and made to 100 ml solution?

Options

A. 2
B. 1
C. 13
D. 12

Answer

D

Explanation

Molecular mass of NaOH=23+16+1=40
Molarity=`("Mass of solute" ("in g")xx1000)/("Molecular mass of the solute"xx"Volume of solutionn\(in L)"` `OH^(-)=10^(-2)mol//L`
So, `pOH=-log[OH^(-)]`
Hence, pOH=2
As we know that, pOH+pH=14 or pH=14-2=12