Question

To increase the $pH$ value of a neutral solution, we should add:

• A. an acid
• B. an acid salt
• C. an alkali
• D. a salt

Answer 1

The correct option is C an alkali

To increase the $pH$ value of a neutral solution, we should add an alkali.
A neutral solution has $pH=7.0$.
A basic solution has $pH>7.0$.
When we add an alkali to a neutral solution, it's pH increases.

Note:
To decrease the $pH$ value of a neutral solution, we should add a acid.

Option C is correct.