Water Alkalinity Analysis Kit
HI3811 is a kit used to measure alkalinity through titration with hydrochloric acid. HI3811 is supplied with all the necessary reagents and accessories to perform approximately 110 tests.
Pre-measured, ready-to-use reagents. All reagents are labeled with an expiration date and lot number for traceability. Manual titration performed using a color indicator.
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| Cod. | 5394904 |
|---|---|
| Weight in gr. | 408 |
| Best before | Sep 1, 2030 |
| Info | All necessary accessories are included in the kit, including a beaker, plastic syringe, phenolphthalein indicator, and bromophenol blue indicator. |
Importance of Use
Water alkalinity refers to its capacity to neutralize acids. It is determined by measuring the amount of acid required to adjust the pH through a fixed endpoint titration. This measurement is crucial for assessing the corrosive properties of water, which are mainly influenced by hydroxide, carbonate, and bicarbonate ions. Additional sources of alkalinity may include anions capable of hydrolysis, such as phosphates, silicates, borates, fluorides, and salts of certain organic acids. Monitoring alkalinity is essential in applications such as drinking water treatment, wastewater management, boiler operation, cooling systems, and soil conditioning.
Alkalinity can be measured as phenolphthalein alkalinity and total alkalinity. Phenolphthalein alkalinity is determined by neutralizing the sample to a pH of 8.3 using a diluted hydrochloric acid solution and a phenolphthalein indicator. This process converts hydroxide ions into water and carbonate ions into bicarbonate ions:
OH- + HCl → H2O + Cl-
CO32- + HCl → HCO3- + Cl-
Since bicarbonate ions can be further converted into carbonic acid with additional hydrochloric acid, phenolphthalein alkalinity accounts for all hydroxide ions but only half of the bicarbonate ions. To fully convert carbonate ions, hydrochloric acid is added until the sample reaches a pH of 4.5 (total alkalinity):
HCO3- + HCl → H2CO3 + Cl-
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