... 3% sodium hydroxide solution, insoluble precipitate; part by adding 24% hydrochloric acid, then dissolved. (4) to neutral to take the sample solution ... a short taste. With other acids such as tartaric acid, malic acid and so on, to make the product taste full ... added to prevent the formation of insoluble in water, sorbic acid - acid crystals, affecting food preservative effect. 2. Scope and usage ( ...