C15.2-Mac#77-hydronium conc. in strong base soln.-#1-AP (Points: 7.14) A solutio

Question

C15.2-Mac#77-hydronium conc. in strong base soln.-#1-AP

(Points: 7.14) A solution is made by dissolving 0.16 g NaOH in enough water tomake 2.0 litres of solution. What is the H+ ion concentration of this solution?



1. ) 1.2 x 10-13M

2. ) 2.0 x 10-3 M

3. ) 8.0 x 10-2 M

4. ) 5.0 x 10-11 M

5. ) 5.0 x 10-12 M

C15.2-Mac#77-hydronium conc. in strong base soln.-#1-AP

(Points: 7.14) A solution is made by dissolving 0.16 g NaOH in enough water tomake 2.0 litres of solution. What is the H+ ion concentration of this solution?



1. ) 1.2 x 10-13M

2. ) 2.0 x 10-3 M

3. ) 8.0 x 10-2 M

4. ) 5.0 x 10-11 M

5. ) 5.0 x 10-12 M

Explanation / Answer

Find the molarity of the solution: (0.16 g NaOH)(1 mol NaOH/39.9969 g NaOH) = 0.00400031 molNaOH 0.00400031 mol NaOH/2 L = 0.002000155 M NaOH Find the pOH of the solution: Because NaOH is a strong base, [NaOH] =[OH-] pOH = -log(0.002000155) = 2.699 Find the pH of the solution: pH + pOH = 14 pH = 14 - 2.699 = 11.301 Find the H+ concentration: pH = -log[H+] [H+] = 10-pH =10-11.301 = 4.9996 x 10-12 M = 5.0x 10-12 M (answer 5)

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