Question

14. Hydrogen gas is evolved by reacting a piece of magnesium ribbon with water:

1)Describe how could show that the gas collected is hydrogen.

2) Write a symbol equation for the reaction taking place between magnesium and water.

3) Suggest how the appearance of magnesium would change after a week.

4) Afew drops of universal indicator solution were added to water in the beaker. What colour would expect to
see and what pH would this colour indicate?​

Answer 1

Answer:

1= we know that hydrogen gas is always burn with a pop sound

2->Mg + H2O -> MgO + H2

Answer 2

Answer:

Hey dude...

1) if we bring a lighted splint near the gas it will burn very brightly, accompanied by explosion along with a "pop" sound this show that the gas evolved is hydrogen

2) Mg+2H2O=mg(oh)2+h2

3) after a week magnesium will lose all its shine and a doposit of magnesium hydroxide will be formed on the surface of the metal

4) the indicator will acquire blue colour indicating that the solution is basic-the ph of solution is expected to be more than 7

Hope this helps...