存在于溶液中 meaning in English

to exist in solution

Together with “ free ” hydroxyl ions already present in solution , these hydroxyls are titrated with protons ( acid ) , to a thermometrically determined endpoint
游离的烃基离子存在于溶液中，用质子(酸)就滴定这些烃基离子，出现了一个温度测量的终点。
The yield of benzaldehyde obtained by using the modified anode containing immobilized hydroquinone was better / worse than that obtained with a pt anode without / with hydroquinone in solution , repectively
由苯二酚固定于白金之电极所得苯甲醛之产率分别白金电极无有苯二酚存在于溶液中之产率为高低。