Last Thursday, we did an experiment where we had 5 test tubes filled with a highly acidic sulphuric acid mixed in with a universal indicator. As we started to add more and more sodium hydroxide, the chemical composition changes continuously causing the colour of the liquid to change.
Colour Changes:
Orange/Yellow: It first started with orange because of a significantly large solution imbalance caused by the amount of sulphuric acid not being enough.
pH level: 3-6
Strength: Weakly Acidic Solution
Ions present: There are still more H+ ions but the concentration is significantly lower. Sodium Ions (Na+) and sulphate ions (SO 2-,4) is still in high quantities. There must also be some traces of OH- in the solution.