AMIE Study Circle

pH of water The dissociation and recombination of water go on till equilibrium is reached, HOH = H⁺ + (OH)⁻ The presence of excess hydrogen ions makes the water acidic and hence corrosive. The pH is the logarithm of the reciprocal of the hydrogen ion concentration. If the hydrogen ion concentration in water is 10⁻⁷, the pH value of water would be log (1/10⁻⁷ ) or 7. Join our WhatsApp Channel -  BOE Adda  for regular updates  

Scale Formation The scale is formed mainly by calcium (and magnesium ) salts present in water. Sodium salts are highly soluble and do not form scales.    Join our WhatsApp Channel -  BOE Adda  for regular updates  

In internal treatment, chemicals are added in the boiler water. Internal treatment to prevent scale deposition is usually carried out with some form of sodium phosphate (trisodium, disodium or monosodium). These chemicals react with dissolved salts to convert them into less harmful sludge which can stay in the boiler water without creating any harm to the boiler tube. Later on, this sludge can be removed from the boiler water by blowdown. The main aim of internal treatment is to precipitate the impurities present in the boiler water to get harmless salts or sludge.  Join our WhatsApp Channel -  BOE Adda  for regular updates