Select all answers from the list below which describe potassium permanganate and/or aqueous solutions of potassium permanganate. Yields manganese(II) ion when oxidized. Available as a primary standard. Self-indicating. Yields manganese(II) ion when reduced. Must be standardized prior to use. Strong reducing agent in basic solution. Unstable. Strong reducing agent in acidic solution. Strong oxidizing agent especially in acidic solution. Intensely coloured. A 3.748g sample of an unknown salt containing ferrous ion was dissolved and diluted to 250.0 mL. Repeat 25.00mL samples of the total solution were titrated with 0.01768MKMnO4 solution, and the mean of three accepted corrected titration volumes was 31.65mL. Calculate the %w/w of iron in the original sample mass. State your answer to 2 places after the decimal place. Do not enter units