Question

Method:
a. Obtain three 500-ml tall-form beakers, and label them LI, Na and K. Add approximately
150 mL of distilled or deionized water to each beaker Label throo Potri dishes Ll, Na and K
and place them next to their respective beakers.

b. The pre-cut lithium, sodium and Potassium metal places should be approximately 0.5 *
0.5 * 0.5 cm or 0.2-0,3 g each.

c. Place one piece of each metal in its respective Petri dish. Observe the physical properties
of the metals: colour, lustre (shino) and hardness.

d. Use forceps or tongs to quickly transfor one place of Lithium metal to water in its labelled
(LI) beaker. Make a detailed observations of the resulting chemical reaction.

e. Repeat step d using Sodium metal and then Potassium in labelled (Na & K) beakers.
Make observations. After the metals have reacted, add 5 drops of Indicator Phenolphthalein
solution to the mixtures in each beaker.

question) Write down all the apparatus and chemicals required for the above experiment
I

Answer 1

Answer:

Weigh a small quantity (500mg or 1 g) of soluble starch on an electronic balance.

Transfer the weighed quantity of starch into a mortar and add few drops of distilled water.

Grind the starch using the pestle to make a thin paste and transfer the paste into a 50 ml beaker.

Take about 100 ml of distilled water in a 250 ml beaker and heat the beaker till the water starts to boil.

Pour the starch paste slowly into the boiling water while stirring using a glass rod.

Continue boiling for about 10 minutes and then allow the beaker to cool.

Filter the contents of the beaker, through a filter paper fixed in a funnel and collect the filtrate.

Label the filtrate as Starch Sol.

Explanation:

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