Part II
1. All solution are same molarity so difference are strong and weak and how many H+ ionizes per molecule of acid. HF is weak acid so it has highest pH, and sulfuric acid has 2 H+ per molecule so it has lowest pH.
2. pH indicator indicates a pH (actually a pH range). The weak acid, that is the indicator, changes colors.
3. 2016-2017 students do not do
4. pH = -log [H+] , pH value and [H+] are indirectly proportional. It can be show in the math by the negative sign.