Question

(a) Which element is common to all acids ?
(b) Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Describe
an activity to prove it. ​

Answer 1

Answer:

1) hydrogen

2) acids have free ions so electricity passes through it but these two don't do that

Answer 2

Answer:

a) hydrogen

b)Alcohols and glucose though contain hydrogen but do not ionise in the

solution to produce H+ ions. This is proved by the fact that there solutions

do not conduct electricity.

Two nails are fitted on a cork and are kept it in a 100 ml beaker. The nails

are then connected to the two terminals of a 6-volt battery through a bulb

and a switch. Some dilute HCl is poured in the beaker and the current is

switched on. The same experiment is then performed with glucose solution

and alcohol solution

Observations : It will be observed that the bulb glows in the HCl solution

and does not glow in the glucose solution.

Result : HCl dissociates into H+ and Cl– ions. These ions conduct electricity

in the solution resulting in the glowing of the bulb. On the other hand, the

glucose solution does not dissociate into ions. Therefore, it does not conduct

electricity.

Conclusion : From this activity, it can be concluded that all acids contain

hydrogen but not all compounds containing hydrogen are acids.

That is why, though alcohols and glucose contain hydrogen, they are not

categorised as acids.