What does the acronym DI stand for in DI water?

What does the acronym DI stand for in DI water?

• A. Dehydrated
• B. Duplex
• C. Deionized
• D. Direct Injection

Answer: (C)

DI stands for deionized. In lab practice, deionized water is produced by passing water through ion-exchange resins that swap dissolved cations (like calcium, sodium) and anions (like chloride, sulfate) for hydrogen and hydroxide ions, which then combine to form water. This removes most dissolved ions, giving water with very low ionic content and high resistivity. Such ion-free water minimizes interference from ions in experiments, precise measurements, and cleaning processes. It’s different from distilled water, which is made by boiling and condensing to remove many contaminants but doesn’t specifically target ions; deionization focuses on removing ionic impurities. Often a mixed-bed resin is used to remove both cations and anions in one step, though trace ions can remain depending on resin capacity and exposure.

DI stands for deionized. In lab practice, deionized water is produced by passing water through ion-exchange resins that swap dissolved cations (like calcium, sodium) and anions (like chloride, sulfate) for hydrogen and hydroxide ions, which then combine to form water. This removes most dissolved ions, giving water with very low ionic content and high resistivity. Such ion-free water minimizes interference from ions in experiments, precise measurements, and cleaning processes. It’s different from distilled water, which is made by boiling and condensing to remove many contaminants but doesn’t specifically target ions; deionization focuses on removing ionic impurities. Often a mixed-bed resin is used to remove both cations and anions in one step, though trace ions can remain depending on resin capacity and exposure.