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Example Questions
Example Question #11 : Acid Base Reactions
Determine the pH of a solution that is .
Since is a strong acid, the concentration of
is equal to the concentration of the acid itself.
Thus, .
Recall how to find the pH of a solution:
Plug in the given hydronium ion concentration to find the pH of the given solution.
Remember to maintain the correct number of significant figures.
Example Question #1 : P H
Find the pH for a solution that is
by mass. Assume a density of
for the solution.
Start by assuming that there is liter of the solution. From this, we can use the given density to find the mass of the solution.
Next, find the mass of that is present in the solution.
Now, find the number of moles of that is present in the solution.
Since we initially assumed that we had liter of the solution, we now also know the concentration of
in this solution.
Since is a strong acid, the concentration of hydronium ions in the solution will be the same as the concentration of
.
Recall how to find the pH of a solution.
Example Question #1 : P H
Find the pH of a solution that is by mass. Assume a density of
for the solution.
Start by assuming that there is liter of the solution. From this, we can use the given density to find the mass of the solution.
Next, find the mass of that is present in the solution.
Now, find the number of moles of that is present in the solution.
Since we initially assumed that we had liter of the solution, we now also know the concentration of
in this solution.
Since is a strong acid, the concentration of hydronium ions in the solution will be the same as the concentration of
.
Recall how to find the pH of a solution.
Example Question #1 : P H
Which of the following techniques will decrease the pH of a solution?
Increasing the concentration of protons
Decreasing the concentration of protons
Increasing the amount of solvent
Increasing the amount of Hydroxide molecules
Adding more acid at the same Molarity of the solution
Increasing the concentration of protons
Increasing the concentration of protons of a solution will make the solution more acidic; therefore, it lowers the solution’s pH. Decreasing the concentration of protons will make the solution more basic, raising the pH. Adding more acid of the same molarity of the original solution will not increase the concentration of protons and will not increase acidity or lower the pH. Increasing the amount of hydroxide ions will make the solution more basic and raise the pH. Increasing the amount of solvent will lower the concentration, affecting molarity and not lowering the pH.
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