ChemistryBhanu · Class 4-5
Haldi ka jaadu: acid aur base ki pehchaan
Peeli haldi nimbu ke paani mein rang nahi badalti, par saabun ke paani mein lal kyun ho jaati hai?
Socho pehle… phir dekho jawab
Kyunki haldi ek 'indicator' ki tarah kaam karti hai. Acid mein woh vaisi hi peeli rehti hai, par base (jaise saabun ka ghol) se milne par lal-bhoori ho jaati hai.
Acid wo padarth hai jo khatta hota hai — nimbu, imli, sirka, dahi mein thoda-thoda hota hai. Base chikna-phisalan bhara lagta hai — saabun uska ek udaharan hai. Base ka swaad kabhi nahi chakhte.
Indicator wo cheez hai jo rang badalkar bata deti hai ki koi ghol acid hai ya base. Haldi ek aisa ghar ka indicator hai: base se milne par uska rang lal-bhoora ho jaata hai.
Cause-effect: haldi mein aisa rang hota hai jo base se milkar badal jaata hai, isliye ek saade kaagaz par yeh test ho jaata hai. Isse hum bina chakhe pehchaan sakte hain ki ghol acid jaisa hai ya base jaisa.
Ghar pe try karo
Bade ke saath: kisi safed tissue par haldi ka ghol lagakar sukhao. Ek katori mein nimbu ka paani aur doosri mein saabun ka paani lo. Ek-ek boond dono patti par daalo — kis par rang badla? Kuch bhi chakhna nahi hai, sab kaam bade ki nigrani mein.
Wow!
Haldi rasoi ka masala bhi hai aur ek chhoti si vigyan-laboratory bhi!
Mummy-Papa ke liye
Aaj bade ki nigrani mein haldi-tissue wala test kijiye — bachche ko khud boondein girane dijiye aur kuch chakhwaiye nahi.
3 sawaal
- Acid ka swaad kaisa hota hai?
Jawab dekho
Khatta. Acid wale padarth khatte hote hain, jaise nimbu aur imli.
- Saabun ke paani se milne par haldi ka rang kaisa hota hai?
Jawab dekho
Lal-bhoora. Base se milne par haldi lal-bhoori ho jaati hai.
- Indicator kya karta hai?
Jawab dekho
Rang badalkar acid ya base batata hai. Indicator rang badalkar batata hai ki ghol acid hai ya base.
NCERT se jodo: NCERT Class 5 EVS — hamare aas-paas ki cheezein; Class 7 Science mein acid-base aayega