Experiment to prepare a true solution of common salt suger and alum in water?
Answers
Answer:
Aim:To prepare true solutions of common salt, sugar and alum separately in water.
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Requirements:Common salt (sodium chloride), sugar, alum, distilled water, measuring cylinder, beakers , glass rods and watch glasses.
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NOTE:In place of beaker the solution may also be prepared in boiling tube or test tube or plastic cup (usually used as tea cup).
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BASIC PRINCIPLE INVOLVED
*When a small quantity of a solid such as common salt (sodium chloride, NaCL) or sugar or alum is added to a glass of water and stirred, the solid dissolves. As a result of this activity a homogeneous material is obtained. This homogeneous material is a true solution.
*In the solution the substance dissolved (such as common salt or sugar or alum) is called solute and water is called solvent.
*A true solution is transparent and stable.
*The solute and solvent cannot be separated from the true solution by the method of filtration.
*In general a true solution is called solution.
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1.Experimental procedure for the preparation of a true solution of common salt in water.
*Take a clean beaker. Paste a paper On it. On this pasted paper Write your Roll No. and the particulars of the solution to be prepared, e.g.. Common salt + Water.
*Take about 20 mL of distilled water in the beaker.
*With the help of a spoon add about I gram of common salt in the water taken in the beaker.
*Take a clean glass rod (its ends should he smooth) and stir the water in, beaker so that salt dissolves completely. Cover the solution with a watch glass to protect it from dust.
*Now a true solution of common salt in water is ready.
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2.Experimental procedure for the preparation of a true solution of sugar in water.
*Take a clean beaker. Paste a paper on it. On this pasted paper write your Roll No. and the particulars of the solution to be prepared, e.g., Sugar + Water.
*Take about 20 ml of distilled water in the beaker.
*Grind sugar into fine powder (Fine powder will dissolve faster)
*With the help of a spoon add about 1 gram of sugar in the water taken in the beaker.
*Take a clean Glass rod (its ends should be smooth) and stir the water in beaker so that sugar dissolves completely. Cover the solution with a watch glass to protect it from dust.
*Now a true solution of' sugar in water is ready.
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SOURCES OF ERRORS AND PRECAUTIONS
*For recognizing the type of solution, its particulars should be mentioned on the beaker or test
tube.
*The solid solute should be powdered so that it dissolves faster.
*The ends of the glass rod should be smooth to avoid any chance of breaking of the glass rod does not strike with beaker or test tube.
*Solute should be added into water carefully.
*Stirring should be done in such a way that the glass rod does not strike with beaker (or test tube).
*The glass rod must be cleaned thoroughly before using it to stir the other solution.
Explanation:
This is your answer
Answer:
A true solution is transparent and stable. Step 1: Three beakers are taken and 100 ml of water is added in each of them and labelled them as A, B and C respectively. Step 2: 10g of finely powdered common salt, sugar and alum is added in each beaker separately. Step 3: Solution is stirred with the help of glass rod.