I'm so frustrated, I can't understand that.
A few days ago we did an experiment: saline hydrolysis
we put some (a teaspoon) Na2SO3 in 10 cm3 of distilled water and then we took the pH, which was approximately 5.
I know that Na+ should not interfere in water hydrolysis, and that SO3-2 act as a weak base.
Then the pH value should be greater than 7, am I right?
Can someone explain me why it happened?
I'm sure not to have contaminated the solution.