Chemical formula for vinegar. Vinegar is composed of about 5% acetic acid. This is the major chemical component of vinegar. The systematic or proper chemical name of acetic acid is ethanoic acid. Vinegar is a weak acid produced by the oxidation of alcohol (ethanol) from wines and ciders by bacteria. It has a pleasant sour taste and is used in cooking or as a condiment.
Although he fights Aizen numerous times (minor battles), this time all of the characters in Bleach are losing terribly, but the last time he fights (battles) Aizen is episodes 309 and 310. The whole battle ranges from episodes 308 - 309. 310 is where the arc finishes off and the Aizen vs Ichigo ends nicely.
=]] EDIT: I don't think the Bleach episode you've watched is an OVA. That may be a filler (a side story episode made so the anime doesn't catch up to the manga.) The episode where Ichigo fights the hollow that killed his mom is an actually episode. Whoever said that doesn't really know what they're talking about. =]. [+Ð½Î±Î¹â ÑÏ ÑÐ½Ñ ÑÐ½Î¹ÑÆ+] Â· 7 years ago.