MediumChemistryHigh School (9–10)GeneralAcids, Bases and Salts › Acids and BasesNumericalAPA-LevelIB
25 mL of 0.02 M hydrochloric acid is made up to 500 mL with water…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
of hydrochloric acid is made up to with water. Find the new concentration of hydrogen ions and the pH.
Need a reminder? The key ideaShow
pH runs from to : below acidic, neutral, above basic. , so for the pH is , and one step is a factor of ten. For bases, pH pOH. Diluting a strong acid ten times raises its pH by .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. New concentration. .
Step 2. pH. , so the pH is .
Answer: and pH . The acid was twenty times weaker after dilution.
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