350mhos cm2equivalent192mhos cm2equivalent.µmhos/cm103 l/cm3106 µmhos/mho(350192)mhoscm2equiv× 107equivliter× 103literscm3× 106µmhosmho.054µmhocmµmho/cm1 × 103gmliter×1 equivalent58 gm158× 103equivalentliter1.7 × 105equivalentliterPrinciples of Water TreatmentDOE-HDBK-1015/2-93WATER PURITYRev. 0CH-04Page 29Conductivity is a measure of the ease with which electricity can be passed through a substance.The presence of ions greatly facilitates the passage of an electric current. Pure water is onlyslightly ionized by the dissociation of water: H O H + OH . At 25 C, the concentration2+ -of the hydrogen and hydroxyl ions is 10 moles/liter.-7 The equivalent conductance of hydrogen (H) isand the equivalent conductance of OH is A mho is a measure of the ease with which electric current will pass and is the inverse of anohm, the measure of resistance to the passage of electric current. Conductance andconductivity are similar qualities (conductivity is measured in , so conductance mustbe converted to conductivity). A mho is one millionth of a mho. The total conductivity ofpure water can be calculated by adding the equivalent conductances of H and OH, multiplyingby the normality (see Module 1 for definition), and then multiplying by and. For theoretically pure water this becomes the following.The conductivity limit for demineralized water is 1 .Conductivity will very quickly indicate the presence of any ionic impurities, even if the impurityconcentration is extremely small. As an example, suppose 1.0 mg of NaCl impurity weredeposited in 1 liter of demineralized water. The normality of this solution would be as follows.
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