10.18. Describe two important uses of each of the following:
(i) caustic soda (ii) sodium carbonate (iii) quicklime.

<p><strong> (i) </strong>Caustic soda<br>It is used in (a) the manufacture of soap, paper, artificial silk and a number of chemicals, (b) in petroleum refining, (c) in the purification of bauxite, (d) in the textile industries for mercerising cotton fabrics, (e) for the preparation of pure fats and oils, and (f) as a laboratory reagent.</p><p><strong> (ii) </strong>Sodium carbonate<br> (a) It is used in water softening, launderingand cleaning.</p><p> (b) It is used in the manufacture of glass, soap, borax and caustic soda.</p><p> (c) It is used in paper, paints and textileindustries.</p><p> (d) It is an important laboratory reagent bothin qualitative and quantitative analysis</p><p><strong> (iii) </strong>Quick lime</p><p> (a) It is an important primary material formanufacturing cement and is the cheapest</p><p>form of alkali.</p><p> (b) It is used in the manufacture of sodiumcarbonate from caustic soda.</p><p> (c) It is employed in the purification of sugarand in the manufacture of dye stuffs.</p>

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