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A solution of a base with pH 12.1 is given. Which of the following can be done to decrease its pH?
P) add distilled water to it
Q) add a solution of a different base with pH 8.7
R) add few drops of an acid with an unknown pH
A. only P
B. only R
C. only P and Q
D. any of P, Q and R
Answer.
A solution of pH 12.1 is a strong base.
On a scale of 0 - 14 bases have higher pH (>7) and acids have lower pH (<7).
The base can be made less basic (it’s pH decreased) by:
- Adding more acid to it
- Adding a less basic solution to it - it may be basic in nature but it is “ more acidic ” when compared to this base. Hence it will decrease the overall pH .
- Diluting the base in water .
Therefore, the correct answer is D .
