a student investigated the diffusion of ammonia gas, nh3, and hydrogen chloride gas, hcl
two sets of apparatus were set up as shown at room temperature and pressure.
source of
ammonia gas
damp red
litmus paper
source of
hydrogen chloride gas
damp blue
litmus paper
apparatus 1
apparatus 2
the damp red litmus paper in apparatus 1 changed colour after 30 seconds.
how long does it take for the damp blue litmus paper to change colour in apparatus 2?
a 64 seconds
b 30 seconds
c 21 seconds
d the blue litmus paper would not change colour.