Working on a membrane for fuel cells ,after measuring the IEC by Acid (0.05 Hcl) -Base (0.05 NaOH) Titrations and using phenolphthalene as an indicator. We need to restore the powder.
if the powder insoluble in water, just wash it several times with distilled water. if the powder is soluble in water, you need first to precipitate it with methanol of acetone and wash it several times with ethanol.