ChemistryBhanu · Class 4-5
Namak kahan gaya? Ghulne ka jaadu
Paani mein chammach bhar namak daalo aur hilao — namak gayab! Kya sach mein khatam ho gaya?
Socho pehle… phir dekho jawab
Nahi! Namak ke chhote-chhote kan paani mein ghul kar faile hue hain. Chakh kar dekho — paani namkeen hai. Namak wahin hai, bas dikh nahi raha.
Kuch cheezein paani mein ghul jaati hain, jaise namak aur cheeni. Kuch nahi ghulti, jaise ret, chaak ka powder ya mitti ke motey kan. Jo ghul jaaye use ghulansheel (soluble) kehte hain.
Garam paani mein cheeni jaldi ghulti hai, aur hilaane se bhi jaldi. Cause-effect: garmi aur hilaana kanon ko tezi se paani mein failaate hain. Isliye mummy chai mein cheeni daal kar chammach chalaati hain. Thande sharbat mein cheeni ghulne mein zyada time leti hai.
Ghula hua namak wapas bhi mil sakta hai! Namkeen paani ko dhoop mein rakh do. Paani bhaap ban kar ud jaata hai aur namak neeche reh jaata hai. Samundar ke kinaare namak isi tarah banaya jaata hai.
Ghar pe try karo
Teen glass lo: ek mein namak, ek mein cheeni, ek mein ret daal kar hilao. Kaun ghula, kaun neeche baitha? Phir thoda namkeen paani ek plate mein daal kar 2-3 din dhoop mein rakho aur dekho kya bacha.
Wow!
India ka sabse zyada namak Gujarat mein samundar ka paani dhoop mein sukha kar banta hai!
Mummy-Papa ke liye
Aaj rasoi mein teen glass se namak, cheeni aur ret ka ghulne wala khel kariye.
3 sawaal
- Inmein se kya paani mein nahi ghulta?
Jawab dekho
Ret. Ret ke kan paani mein nahi ghulte, woh neeche baith jaate hain.
- Cheeni jaldi ghulani ho toh kya karoge?
Jawab dekho
Garam paani lekar hilaunga. Garmi aur hilaane se cheeni ke kan paani mein jaldi failte hain.
- Namkeen paani ko dhoop mein rakhne se kya bachega?
Jawab dekho
Namak. Paani bhaap ban kar ud jaata hai, namak plate mein reh jaata hai.
NCERT se jodo: NCERT Class 5 EVS (Looking Around) — cheezein paani mein ghulna aur alag karna