The following figure represents solutions that occur at various stages during the titration of a weak acid, HA, with NaOH. (The Na+ ions and water have been omitted for clarity.) Which of the following statements are true? Four sets of molecules. In set one, there are two moles HA to four moles A-. In set two, there are two moles OH- to six moles A-. In set three, there is only HA. And in set four, there is only A-. (i) The equivalence point is represented in (iv). (ii) Both (i) and (ii) are buffer solutions. (iii) The highest pH is represented by (ii). The following figure represents solutions that occur at various stages during the titration of a weak acid, , with . (The ions and water have been omitted for clarity.) Which of the following statements are true? Four sets of molecules. In set one, there are two moles HA to four moles A-. In set two, there are two moles OH- to six moles A-. In set three, there is only HA. And in set four, there is only A-. (i) The equivalence point is represented in (iv). (ii) Both (i) and (ii) are buffer solutions. (iii) The highest is represented by (ii). statements (i) and (iii) are true. all three statements are true. only one statement is true. statements (ii) and (iii) are true. statements (i) and (ii) are true.