ChemistryPushan · Class 9-10
PoP ki murti paani mein ghulti kyun nahin?
Mitti ki murti visarjan ke baad paani mein mil jaati hai, par Plaster of Paris wali kinaare par waapas kyun aa jaati hai?
Socho pehle… phir dekho jawab
Kyunki PoP paani ke saath milkar ek sakht patthar jaisi cheez — gypsum — ban jaata hai. Yeh ek chemical change hai, aur gypsum paani mein bahut dheere-dheere hi ghulta hai.
Plaster of Paris ka chemical naam hai calcium sulphate hemihydrate, CaSO4·½H2O. Yeh gypsum (CaSO4·2H2O) ko lagbhag 373 K par garam karke banta hai — garam karne se gypsum apne kuch paani ke molecules kho deta hai.
Ab ulta khel: PoP mein paani milao toh woh paani waapas le leta hai aur phir se gypsum ban jaata hai, ek hard solid mass. Isi wajah se doctor toote haddi par PoP ka plaster chadhate hain aur murtikar isse saanche mein dhaalte hain — jaldi set, mazboot.
Par yahi mazbooti nadi aur samundar ke liye problem hai. Mitti ke kan paani mein bikhar kar waapas zameen ka hissa ban jaate hain. Gypsum ki murti saalon tak tukdon mein padi reh sakti hai, aur us par lage chamkile paints bhi paani mein chale jaate hain. Isliye log ab mitti ki murti aur ghar par balti ya kund mein visarjan chun rahe hain.
Ghar pe try karo
Ek chhota mitti ka dhela aur ek purana PoP ka tukda (toota khilona ya plaster ka tukda, bade ki madad se) alag-alag glass paani mein daal do. Ek din baad dekho: kaunsa bikhar gaya, kaunsa waisa ka waisa hai?
Wow!
Jo reaction toote haddi ko jodne mein hero hai, wahi nadi mein villain ban jaata hai — chemistry wahi, jagah alag.
3 sawaal
- Plaster of Paris ka formula kya hai?
Jawab dekho
CaSO4·½H2O. PoP calcium sulphate hemihydrate hai — har do CaSO4 par ek paani ka molecule.
- PoP mein paani milane par kya banta hai?
Jawab dekho
Gypsum. PoP paani lekar waapas gypsum ban jaata hai, jo ek hard solid hai.
- PoP ki murti nadi ke liye problem kyun hai?
Jawab dekho
Woh sakht gypsum ban kar bahut dheere tootti hai. Gypsum paani mein bahut dheere ghulta hai, isliye tukde aur paints lambe samay tak paani mein rehte hain.
NCERT se jodo: NCERT Class 10 Science — acids, bases aur salts (Plaster of Paris aur gypsum)