I need some acid-washed sand to smooth out boiling in diethyl ether synthesis. I aready have pre-washed sand for general filtration purposes, but it is not labeled as acid-washed.
Unfortunately, I have not found any reliable lab manual for acid washing of sand.
I found one reference instructing to wash 30 g of sand twice with 0.05 M sulfuric acid, then four times with distilled water.
However, other references instructing to use only hydrochloric acid and de-ionized water, but have not specified how much or the concentration.
Yet another reference says that sulfuric, hydrochloric or phosphoric acid can be used interchangeably.
I don't know how seriously should I take the acid washing step (for the ether synthesis from ethanol and sulfuric acid) and how to check whether it is properly washed (pH measurement?).
I know one can just purchase acid-washed sand, but I have excess of good quality sand and the professional acid-washed one is overly expensive.