Which of the following statements concerning the water hardness experiment is/are false? Select all that apply. OA Hard water is usually expressed as total parts per million (ppm) of EDTA by weight. |B. A standard solution of calcium carbonate is used to standardize the EDTA solution. C. The softening of water refers to the removal of magnesium and calcium ions from solution. |D. Hard water prevents the formation of soap lather. E. EDTA is a chelating agent that can lose 4 protons.