PH scale is used to determine how acidic , basic or neutral a solution is. It can be calculated using the following equation
pH = -log [H₃O⁺]
hydronium ion concentration has already been given
[H₃O⁺] = 4.91 x 10⁻⁴ M
pH = -log[4.91 x 10⁻⁴ M]
pH = 3.3
the pH of medium is 3.3
The less buoyant oceanic plate sinks and slides under the continental plate
2H₂ + O₂ -------> 2H₂O
mole of H₂ =
=
= 0.7 mol
mole ratio of H₂ : H₂O
= 1 : 1
∴ if mole of H₂O = 0.7 mol
then mole of water = 0.7 mol
Thus:
mass of water = mole x Mr
= 0.7 mol x ((2 x 1) + (1 x 16))
= 12.6 g of water vapour