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.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

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