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        <div id="content-top1">Page 9 - 8-Sci-6 ACIDS, BASES/ALKALIS AND SALTS</div>
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    <pre style="white-space:pre-line"><code>6. ACIDS, BASES/ALKALIS AND SALTS                                        eLearn.Punjab

Do you know?
All alkalis are bases but all bases are not alkalis.

Properties of Bases / Alkalis

     (i) Aqueous solution of a base has a soapy touch.

Activity 6.4

Apparatus / Material required:

     Test tube, sodium hydroxide, water, etc.

Procedure:

â€¢	 Take 10 cm of water in a test tube.
â€¢	 Add a few pellets of sodium hydroxide and shake it.
â€¢	 Touch the solution with your fingers.

   How do you feel?

(ii) Bases turn red litmus blue, colourless phenolphthalein pink and methyl orange
   yellow. They turn turmeric paper brown.

(iii) Aqueous solutions of bases are good conductors of electricity.

(iv) Bases react with acids to form salts and water. The reaction is called neutralization
   reaction.

NaOH (aq) + HCl (aq) ï£§ï£§â†’ NaCl (aq) + H2O (l)

Sodium     Hydrochloric                                 Sodium    Water
hydroxide      acid                                     chloride

Activity 6.5

Apparatus / Material required:

     Test tube, sodium hydroxide solution, dilute hydrochloric acid, phenolphthalein,
etc.

Procedure:

â€¢	 Take 3 cm of sodium hydroxide solution in a test tube.
â€¢	 Add a drop of phenolphthalein solution to it. It turns pink.
â€¢	 To this, add dilute hydrochloric acid slowly until the colour is discharged.

   Transfer the solution to a china dish and evaporate it to dryness.     
   What do you observe?

                                   9

                                                                                                           V: 1.1</code></pre>
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