sodium oxide, Na2O, is basic. This is because it is a metal oxide. Metal oxides tend to be basic while non metal oxides tend to be acidic.
Sodium Sulfide is the salt of a strong base (NaOH) and a Weak Acid (H2S).
Therefore, it's basic.
Sodium iodide is neutral.
basic
acidic
neutral
Neutral
It is neutral.
Basic
basic
acidic
Acidic
its acidic
acidic
Tomato is acidic.