Is RO water acidic
Deionized and demineralized water
About deionized, demineralized and distilled water and measurement of the purity of such water
It is quite difficult to find a clear definition of distilled, demineralized and deionized water. The production of distilled water is probably the easiest entry into the field of the production of (highly) pure water.
The distillation is one of the oldest and best known methods of producing pure water. The raw water is evaporated in a still and condensed back into liquid water in a cooling unit (condenser). Dissolved ingredients such as salts remain in the evaporation vessel while the water leaves it in the form of steam. In addition to the salts, however, the raw water can contain volatile substances that, like water, evaporate and condense. These include, above all, alcohols. Higher quality stills can selectively distill water alone alongside other ingredients present. However, the transfer of volatile substances and small amounts of non-volatile ingredients through bursting water bubbles cannot be completely avoided. The highest degrees of purity that can be achieved with such stills are 1.0 MΩ.cm. The pH of the distilled water produced becomes slightly acidic (4.5 - 5.0) if carbon dioxide from the ambient air can dissolve in it.
Deionization: Process using special Ion exchangerswhich remove the ions of the salts from the water. Theoretically, 100% of the salts contained can be removed. Deionization does not reduce any organic components in the water, viruses or bacteria. It happens, however, that these remain in the ion exchange resins by chance, especially strongly basic anion exchange resins can remove gram-negative bacteria. 
Demineralization: Any process used to remove minerals from water. In general, this term is used for Ion exchange processes used. 
Deionization takes place through the binding of dissolved, electrically charged substances in water to cation or anion exchange resins. The Resins are located in containers and the water to be treated flows through them. The whole process is called Ion exchangeand can be used in various applications for the production of deionized water.
Next to the Ion exchange there is the possibility of deionized water through Reverse osmosis systems to manufacture. The Reverse osmosis is the finest known filtration to date. The process enables the removal of tiny particles from solutions. Reverse osmosis is used to treat water, remove salts and other contaminants in order to improve the color, taste and other properties of a fluid. The process is also suitable for retaining bacteria, salts, sugars, proteins, particles, dyes and other components with a molecular weight of more than 150-250 Dalton.
Measurement of the purity of deionized water
The purity of water can be determined using various methods. This includes recording the weight of all dissolved substances in the water. In addition to determining the weight of foreign substances, their amount can be determined by using their influence on the increase in the boiling point or the decrease in the freezing point of water. The refractive index is also influenced by solids in the water. Alternatively, the purity can be determined on the basis of electrical conductivity or resistance. Deionized water hardly contains any ions, so that it has a low electrical conductivity and a high resistance.
Pure water is usually slightly acidic PH value on and distilled water can reach pH levels of around 5.8. The reason for this is to be seen in the fact that distilled water dissolves carbon dioxide from the ambient air. The carbon dioxide is absorbed until a dynamic equilibrium is established between the water and the ambient air. The amount of carbon dioxide ultimately dissolved in the water is determined by the carbon dioxide concentration in the surrounding atmosphere. The dissolved carbon dioxide reacts with the water and ultimately forms carbonic acid.
2 H2O + CO2 -> H2O + H2CO3 (Carbonic acid) -> (H30+) + (HCO3-) (hydrogen carbonate)
Only freshly made distilled water has one PH value from about 7 to, however, as soon as it is influenced by the presence of carbon dioxide, a slightly acidic pH value sets in in the course of a few hours. It should also be pointed out that the pH value of ultrapure water is difficult to determine. Due to its purity, ultrapure water not only quickly absorbs impurities that affect the pH value (e.g. carbon dioxide), but also makes pH value measurement difficult due to its low conductivity.
An exact PH value Determination for Ultrapure water enables the determination of the electrical resistance. For a given resistance value, the pH value must be within certain limits. For example, a water sample with an electrical resistance of 10 MWcm would have to have a pH value in the range of 6.6 and 7.6. This relationship between electrical resistance and pH value of highly pure water is shown in the adjacent figure. 
The pH value is shown on the abscissa and the electrical resistance in MΩ / cm on the ordinate.
Compared to beverages, however, the pH of distilled water is only slightly acidic.
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