ChemistryPushan · Class 9-10
pH ka number: khatte se chikne tak ka scale
Do ghol dono 'acid' hain, phir bhi ek nimbu jaisa aur doosra bahut zyada tez kaise ho sakta hai?
Socho pehle… phir dekho jawab
Kyunki acid ki taakat H+ ions ki maatra par nirbhar karti hai. pH scale (0 se 14) isi ko ek number mein batata hai: 7 neutral, 7 se kam acidic, 7 se zyada basic.
Mechanism: acid paani mein ghulkar H+ ions deta hai, aur base OH- ions. Jitne zyada H+ ions, utna kam pH aur utna zyada acidic ghol. pH 7 neutral hai (jaise saada paani), 7 se kam acidic, 7 se zyada basic (saabun jaise).
Number yaad rakho: pH scale logarithmic hai — ek pH ki ikaai ka farak matlab H+ ions ka 10 guna farak. Isliye pH 3 wala ghol pH 4 wale se 10 guna zyada acidic hai. Neutralisation mein acid + base = salt + paani.
Prakriti ka link: saaf baarish ka paani bhi thoda acidic hota hai (hawa ki carbon dioxide ghulne se, pH lagbhag 5.6). Isse kam pH ho toh use acid rain kehte hain. So what: pH sirf lab ka number nahi — mitti, nadi aur smarakon ki sehat isi se judi hai.
Ghar pe try karo
Ek chart banao: pH 1 se 14 tak ek line kheencho. Nimbu, sirka, saada paani, saabun ka ghol — inhe apni samajh se rakho aur likho kyun. Baad mein NCERT se milao.
Wow!
pH ek ikaai badalne ka matlab hota hai 10 guna farak — isliye ek chhota number bada asar dikhata hai!
3 sawaal
- Neutral ghol ka pH kitna hota hai?
Jawab dekho
7. Neutral ghol (jaise saada paani) ka pH 7 hota hai.
- pH 3 wala ghol pH 4 wale se kitna zyada acidic hai?
Jawab dekho
10 guna. pH scale logarithmic hai: ek unit ka farak 10 guna H+ ions ka farak hai.
- Acid rain kaun sa kehlata hai?
Jawab dekho
Jiska pH lagbhag 5.6 se kam ho. Saaf baarish ka pH lagbhag 5.6 hota hai; usse kam ho toh acid rain.
NCERT se jodo: NCERT Class 10 Science — acids, bases and salts