Questão de Química

Leia o texto a seguir e responda a questão. pH electrode maintenance Daily maintenance The soaking solution (3 M KCl pH 4.0) contained in the supplied protective bottle is used to maintain activation in the glass bulb and junction. Loosen the capsule, remove the electrode and rinse in pure water before taking a measurement. Insert the electrode and tighten the capsule after measurements to prevent the solution from leaking. If the soak solution is turbid or moldy, replace the solution. The electrode should not be soaked in pure water, protein solution or acid fluoride solution for long periods of time. In addition, do not soak the electrode in organic silicon lipids. For best accuracy, always keep the meter clean and dry, especially the meter’s electrode and electrode jack. Clean with medical cotton and alcohol if necessary. Electrodes that have been used over a long period of time, will become ageing. Submerge the electrode in 0.1mol/L hydrochloric acid for 30 seconds, then wash the electrode in pure water, then submerge it in soaking solution for 24 hours. Fonte: https://www.xsinstruments.com/Media/FileDocumenti/ENG/manuali/Serie50_Plus.pdf De acordo com o texto, o eletrodo de um pHmetro deve ser mantido em: