Ion-Exchange Resin Riddle 🧪🔁

Question 1

What exactly is an ion-exchange resin? 🤔🔄

Accepted Answer

A crosslinked polymer bead with charged functional groups that chemically exchange ions 🔬

Answer

A fine physical sieve that traps ions like dirt in a net 🧹

Answer

A magnetic bead that attracts charged particles with a magnet 🧲

Answer

A catalyst that converts ions into neutral atoms ⚡

Question 2

Which functional group is commonly found on strong-acid cation resins? 🧪🧡

Accepted Answer

Sulfonic acid groups (–SO3H) 🔴

Answer

Quaternary ammonium groups (–NR4+) 🔵

Answer

Hydroxyl groups (–OH) 🌊

Answer

Carboxyl groups (–COOH) 🟢

Question 3

If a sodium-form resin removes one Ca2+ ion from water, how many Na+ ions are released? 🔢⚖️

Accepted Answer

Two Na+ ions are released (2 × Na+ ↔ Ca2+) ➕➕

Answer

One Na+ ion is released ➕

Answer

Half a Na+ ion is released (0.5) ❓

Answer

Three Na+ ions are released ➕➕➕

Question 4

Which chemical is commonly used to regenerate a sodium-form cation softening resin? ♻️🧂

Accepted Answer

Concentrated NaCl brine (salt) 🧂

Answer

Sodium hydroxide (NaOH) 🧪

Answer

Distilled water 💧

Answer

Hydrogen peroxide (H2O2) 🧫

Question 5

Which surprising or high-value application can ion-exchange resins be used for? 💎🔬

Accepted Answer

Recovering precious metals (like gold and platinum) from dilute solutions ♻️💰

Answer

Acting as a battery electrode to store electrical charge 🔋

Answer

Replacing reverse-osmosis membranes to block salts physically 🚫💧

Answer

Sterilizing water by killing bacteria 🧫❌