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

• Hydrogen is common to all Eg: HCl, H2SO4, HNO3
• Procedure

Take samples of alcohol, glucose and hydrochloric acid. Take 100 mL Beaker and take a fork and fix the nails. Place the cork inside the beaker and connect the nails to two terminals of a 6 volt battery through a bulb and a switch. Add some hydrochloric acid to the beaker and on the current. Repeat the procedure with alcohol and glucose

Observation:

In the case of acid the bulb will glow and in case of alcohol and glucose it does not glow because the electric current is carried through the solution by ions.

Conclusion

Acid ionizes to give H+ ions in aqueous medium but glucose and alcohol don not furnish H+ ions even though they contains hydrogen atoms.