Answer:
C.
Explanation:
The increase the [H+] (concentration of H+ ions)
However, they decrease the pH if acids are added to any solution. Since they have more [H+] ions, they increase their conc. in the solution
You can tell if each side of the equation has the same molar mass.
The first part of two is heat, not temperature, once that is cleared up: starting from 3: temperature, concentration, collisions, catalytic converter, surface area