Question

(a) How will you prepare a fresh solution of sodium hydroxide?
(b) What happens if you drop a piece of aluminium foil into this solution?
(C) How do you know hydrogen gas is evolved in the reaction?​

Answer 1

Answer:

1.To make 1 M NaOH solution, you have to dissolve 40.00 g of sodium hydroxide pellets in 250 mL distilled water and then make up the solution to 1 liter. Weigh 19.95 gm of NaOH pellets & dissolve them in half liter(500ml) of distilled water water, what you will be having now is 1M NaOH solution.

2.Al+naoh h2o=NaAlO2 +H2

it will form sodium almuinate

3.by placing the fire above test tube

hope it helps follow me