In setting up this experiment, a student noticed that a bubble of air leaked into the syringe containing the hcl (aq) solution, but it was not taken into consideration for the volume added to the flask. what effect would this have on the measured volume of hydrogen gas? would the calculated molar volume of hydrogen be:

Experimentally, the molar volume of hydrogen gas is measured by reacting a piece of metal like magnesium with excess hydrochloric acid. The reaction which takes place is-

Mg (s) + 2HCl(aq)→ MgCl2(aq) + H2(g)

Since HCl is taken in excess, the limiting reagent is Mg. Thus, the molar volume of H2 formed would depend only on the number of moles of Mg.

Therefore, if a bubble leaked into a syringe containing HCl, that would not affect the measured volume or the molar volume of hydrogen gas.

c is the answer because when something is left after something evaporates that shows the chemical change.