An solution containing an unknown quantity of iron(II) being titrated according to the following reaction:
If 39 mL of the unknown iron(II) solution requires 24 mL of 0.24M solution of Potassium
permanganate to observe a persistent pink color (the end point), What is the concentration of
iron (11)?

5Fe2+ (aq) + Mn0, (aq) + 8H* (aq) — 5Fe3+ (aq)) + Mn2+ (aq) + 4H20

Which statement correctly describes potassium iodide, ki? there is a one-to-one ratio of potassium ions to iodide ions. potassium gains electrons and iodine loses electrons during the reaction. the lattice is held together by potassium anions and iodide cations.

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?