What is the [H+ ] of an HCl solution if the pH is measured to be 4?

D=m/v =57.9/3 = 19.3 g/cm^3

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.

Precipitation reactionsneutralization reactions (or acid base)

Ok, just worked through it and came up with