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Explain the Ion Exchange water Softening
Softening is usually done using a resin (natural or synthetic long chain chemical with a sodium ion attached). When water containing hardness ions is passed through the resin, the hardness ions (Ca, Mg) exchange with Na ions on the resin (thus the resulting water is free of hardness ions but high in sodium).
When the sodium ions on the resin are exhausted, the resin is regenerated using a brine solution (which replaces all hardness ions attached to the resin with Na ions again) and the resin can be used again.
what are the defects in timber
with a neat well labelled sketch, explain reciprocal ranging.
In order to determine the water content of a wet sand, a sample weighing 4 N was put in a pyknometer. Water was then poured to fill it and the weight of the pyknometer and its con
Define Vertical Curves - Transportation 1) Vertical curves are used to change the grade of a highway. 2) Most vertical curves take the shape of an equal-tangent parabola.
They stop, or slow down erosion, and stop long shore drift. This, though, can have bad knock-on effects somewhere near.
what is linear water way
Define Hardness - Chemical Characteristics of Water Caused by any polyvalent cations (mainly Calcium and Magnesium). Expressed as mg/l as CaCO 3 . Causes precipitates with soap
California Bearing Ratio (CBR): The most widely used test for determining the supporting power of a soil for designing the thickness of pavements is the California Bearing Ra
define distribution factor and shape factor
A retaining wall with a smooth vertical back retains a purely cohesive fill. Height of wall is 12 m. Unit weight of fill is 20 kN/m 3 . Cohesion is 1 N/cm 2 . What is the total act
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