CHEMISTRY GLOSSARY
practical salinity → praktični salinitet
Practical salinity SP is defined on the Practical Salinity Scale of 1978 (PSS-78) in terms of the conductivity ratio K15 which is the electrical conductivity of the sample at temperature t68 = 15 °C and pressure equal to one standard atmosphere, divided by the conductivity of a standard potassium chloride (KCl) solution at the same temperature and pressure. The mass fraction of KCl in the standard solution is 0.0324356 (32.4356 g of KCl in 1 kg of solution). When K15 = 1, the Practical Salinity P S is by definition 35. The conductivity of that reference solution is C(35,1568,0) = 42.914 mS/cm = 4.2914 S/m (Siemens per meter). Note that Practical Salinity is a unit-less quantity. Though sometimes convenient, it is technically incorrect to quote Practical Salinity in "psu". When K15 is not unity, SP and K15 are related by the PSS-78 equation
At a temperature of t68 = 15 °C, Rt is simply K15 and Practical Salinity SP can be determined from the above equation. For temperatures other than t68 = 15 °C, Practical Salinity SP is given by the following function of Rt (k = 0.0162)
solubility product constant → konstanta produkta topljivosti
Solubility product constant (Ksp) (or the solubility product) is the product of the molar concentrations of the constituent ions, each raised to the power of its stoichiometric coefficient in the equilibrium equation. For instance, if a compound AaBb is in equilibrium with its solution
the solubility product is given by
titar → titar
Titar (T) is a mass of titrated matter which is equivalent to 1 cm3 of solution. It is shown as T = 2.356 mg HCl / 1.0 cm3 NaOH, 0.1000 moldm-3, and it is usually shown in a table form. If the concentration of used standard solution (c) differs from one outlined in the table data (c0), the factor of correction (f) is induced
Titar is usually used in industrial operational laboratories where from titar tables mass or percentage of the ingredient in question is directly read.
Citing this page:
Generalic, Eni. "Faktor zaostajanja." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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