A sample of tap water contains 0.1 5mg of Fe 3+ per dm 3 = 3333 = 333 AAMI \ \ ^ lk.% % W 71» MO tw WO MU aji! Iwt m Hr.l VsiLi 5.2 Definition of pH pH = - 1140 kj of heat. 129 Download free eBooks at bookboon.com Fundamentals of Chemistry The Mole.