pH Calculation After Mixing Acid and Base
HSC Chemistry Syllabus
- Calculate the pH of the resultant solution when solutions of acids and/or bases are diluted or mixed
pH After Mixing Acid and Base
How to Approach These Questions
The pH of the final solution after mixing an acid and a base depends on the substance in excess.
- When an acid is in excess, the pH of the final mixture will be < 7.0
- When a base is in excess, the pH of the final mixture will be > 7.0
Therefore, the objective of this type of questions is to calculate the number of moles of acid and base, and determine whether the acid or the base is in excess.
Calculate the pH after 30 mL of 0.10 mol L–1 sodium hydroxide is added to 50 mL of 0.30 mol L–1 hydrochloric acid solution. Include a balanced equation in your answer.
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