• # question_answer 64) How many moles of HCl must be removed from 1 litre of aqueous HCl solution to change its pH from 2 to 3- A) 1                     B) 0.02C) 0.009               D) 0.01

$\Delta N={{10}^{-}}^{2}-{{10}^{-}}^{3}$ $={{10}^{-}}^{2}\left( 1-0.1 \right)$ $=\text{ }9\,\,\times \,\,{{10}^{-}}^{3}$ $\therefore \,\,\,\Delta \,M=\text{ }9\,\,\times \,\,{{10}^{-}}^{3}$ $\therefore \,\,\,\Delta \,moles=\text{ }9\,\,\times \,\,{{10}^{-}}^{3}$