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Define Hardness - Chemical Characteristics of Water
Caused by any polyvalent cations (mainly Calcium and Magnesium). Expressed as mg/l as CaCO3. Causes precipitates with soap (forms scum) and reduces the effectiveness of soap.
Carbonate hardness (also known as temporary hardness) is the hardness associated with bicarbonate and carbonate ions (alkalinity) and the remaining hardness is termed non carbonate hardness (permanent hardness) and typically is associated with sulfate and chloride. Carbonate hardness can be removed by heating water.
Hardness is removed by lime-soda softening process or ion exchange process (discussed later). Hardness is measured by titrating with EDTA (standard is chosen so that 1 ml titrant gives 1 mg/l as CaCO3 hardness)
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Explain the crushing strength test
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How to compute the tabulations?
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Explain the Confined Aquifer and Piezometric Surface Confined Aquifer Groundwater is confined by impervious geologic stratums on all sides. The water may be under pressure.
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WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF TIMBER FOR CIVIL ENGINEERING
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(a) Relate dissimilar formations of soils to the geological aspects. (b) Explain different types of texture and structure of soils. (c) Bring out the typical characteristics
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