Answer:
F = K Q1 Q2 / R^2 force between 2 charged partices
F2 / F1 = (R1 / R2)^2 = (1 / 2.69)^2 = .139
F2 = .139 F1
I do not know which substance you are referring to, but the freezing point of water is 32°F, or 0°C.