1. If the pH of a solution is 6.79, calculate the a) hydronium ion concentration

Question

1. If the pH of a solution is 6.79, calculate the

a) hydronium ion concentration in the solution. SHOW YOUR WORK!

b) hydroxide ion concentration in the same solution. SHOW YOUR WORK!

3- What is the percent by mass of bromine in CaBr2?            SHOW YOUR WORK!      

2- A solution of potassium carbonate has a pH greater than 7. The solution has

1) an equal number of hydronium and hydroxide ions           2) more hydronium ions than hydroxide ions

3) fewer hydronium than hydroxide ions 4) neither hydronium nor hydroxide ions

Explanation / Answer

pH = -log(H+)

[H+] = e^(-pH)= e^(-6.79)= 1.124 mM

[OH-] = e^(-(14-pH))= e^(-7.2) = 0.7465 nM

2- A solution of potassium carbonate has a pH greater than 7. means sol is alkaline.. hence...

     2) more hydronium ions than hydroxide ions

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