Gulaab, Haldi aur Gandh Indicator
Class 7 Science · Chapter 2: Padaarthon ki Khoj: Acidic, Basic aur Neutral · NCERT Curiosity section 2.1.2–2.1.3
Seekho
Litmus nahi? Phool use karo! Zoya gire hue laal gulaab ki pankhudiyan ikattha karti hai, kuchalti hai, garam paani mein bhigoti hai (bade ki madad se) aur rangeen tarl chhaanti hai: gulaab ka ark. Neembu ras se ye laal hota hai; saabun ke ghol se hara; namak ke ghol se nahi badalta.
rose extract: red = acidic · green = basic
Chukandar, baingani patta-gobhi, jamun aur laal gudhal se bhi indicator bante hain. Pahaadon mein hydrangea ke phool acidic mitti mein neele aur basic mitti mein gulaabi ya laal hote hain, to maali mitti badalkar unka rang badal sakta hai!
Haldi kaagaz: filter paper ko haldi ke lep mein dubaakar sukhaao. Saabun ya baking soda ghol ki boond use laal karti hai; acid aur neutral padaarth use peela hi chhodte hain. To haldi base pakadti hai par acid aur neutral mein farak nahi kar sakti. Isiliye safed kameez par sabzi ka daag saabun lagaane par laal ho jaata hai!
turmeric: red = basic · yellow = acidic or neutral
Kuch indicator gandh se kaam karte hain: ye olfactory indicator hain. Raat bhar kate pyaaz ke saath rakhi kapde ki pattiyon mein pyaaz ki gandh aati hai; baking soda ghol ki boond se gandh feeki ho jaati hai, jabki imli ke paani se bani rehti hai. Gandh indicator un logon ki madad karte hain jo rang nahi dekh sakte. Aadhunik Bharatiya rasayan ke pita Acharya P.C. Ray ne 1901 mein Bharat ki pehli dawa company banaayi.
Explore: gulaab ka test.
- Har namoona gulaab ke ark se test karke sort karo.
Yaad rakho
- Gulaab ark acid mein laal, base mein hara; haldi sirf base mein laal.
- Pyaaz jaise olfactory indicator acid ya base mein gandh badalte hain.
Quick check
Ek tarl se haldi kaagaz peela hi rehta hai. Kya keh sakte ho?
- acidic ya neutral, basic nahi
- zaroor acidic
- zaroor basic
- zaroor neutral
Answer
acidic ya neutral, basic nahi. Haldi sirf base mein laal, to peela sirf basic ko hataata hai.
Socho
Meher aisa gupt sandesh kaise likhe jo chhidakne par hi dikhe?
Ek answer
Kaagaz par haldi lagaakar sukhaao, phir saabun ke ghol se likho. Ya saabun ghol se likhkar haldi ka ghol chhidko: shabd laal ho jaate hain.
Practice
Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.