# Answered Essay: 1. Answer the following: a. When a basic solution is dissolved in water, how and why does the concentration

a. When a basic solution is dissolved in water, how and why does the concentration of H+ ions change in the solution?

b. What is the difference in H+ ion concentration between a solution that is pH 2 and a solution that is pH 6?   If a solution has a pH of 6, express the concentration of H+ in moles/liter.

a) Basic solutions contain OH- ions, so when it dissolved in water OH- ion concentration increases and H+ ion concentration decrease and pH of the solution increases

ionic product of water, Kw = [ OH- ] [H+] = 1.00 ×10^-14

pKw = – log ( [ OH] [ H+ ] ) = 14

= (- log [ OH- ] )+ (-log[H+ ])

= pH + pOH

Therefore,

pH + pOH = 14

if OH- ion concentration of a solution is more 1× 10^-7 M , for example 1×10^-6 its pH increase

pOH = 6

pH + 6 = 14

pH = 14 – 6

= 8

b) Solution with pH 2 has more H+ concentration than solution with pH 6

pH = – log[H+ ]

when pH = 6

– log [ H+ ] = 6

[ H+ ] = 1×10^-6M = 1×10^-6 moles /liter

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