Educational Galaxy

अम्ल, क्षारक एवं लवण — EG के अपने शब्दों में सार

Book: Vigyan (BSEB, Class 10 Science)  |  Chapter 2  |  Medium: Hindi (English technical words saath me)

Diagram (image par Hindi labels lage hain): Test tubes me alag rang ke ghol. Indicator ka rang badalna hi batata hai ki ghol aml hai, kshar hai ya udaseen. Rang dekhkar seedha naam mat lagao — pehchaan ke liye litmus ya pH ki jaanch zaroori hoti hai.

1. Aml aur kshar ko pehchanna kaise?

Apne shabdon me: jo cheez khatti lage aur neele litmus ko lal kar de, use aml kehte hain — jaise nimbu me citric acid, sirke me acetic acid. Jo cheez chhoone par chikni/sabuni lage aur lal litmus ko neela kar de, use kshar (base) kehte hain — jaise sabun aur dhone ka soda ka ghol. Jo na aml ho na kshar, use udaseen (neutral) kehte hain — jaise shuddh pani.

Caption: रसोई की चीज़ें — नींबू, सोडा पाउडर, साबुन और पानी। ये रोज़ की चीज़ें अम्ल-क्षार की पहचान समझने में मदद करती हैं; इस चित्र से किसी चीज़ का pH मान नहीं बताया जा रहा है।

2. Indicator kya karta hai?

Indicator ek aisi cheez hai jo apna rang badalkar batati hai ki ghol kaisa hai. Litmus sabse mashhoor hai: aml me neela litmus lal, kshar me lal litmus neela. Haldi bhi ek natural indicator hai — kshar me uska rang lal-bhura ho jaata hai. Gudhal (China rose) ka ras bhi aml me gehra gulabi aur kshar me hara dikhata hai. Board me aksar poochha jaata hai: kaunsa indicator kis ghol me kya rang dega — isliye rang yaad karne ki bajay ek chhoti table khud banakar yaad karo.

3. pH scale — ek line me samajh

pH ek 0 se 14 tak ka scale hai jo batata hai ki ghol kitna aml ya kshar hai. 7 matlab udaseen. 7 se kam matlab aml (jitna kam, utna tez aml), 7 se zyada matlab kshar. Roz ka example: hamare pet me hydrochloric acid hota hai jo khana pachane me madad karta hai; jab ye zyada bane to acidity hoti hai aur uske liye antacid (ek halka kshar) liya jaata hai, jo acid ko udaseen karta hai.

Caption: पाँच परखनलियों में रंगों का क्रम — लाल (तेज़ अम्ल) से हरा (उदासीन) होते हुए बैंगनी (तेज़ क्षार) तक। यह सूचक रंगों का सरल क्रम है, इस पर कोई संख्या नहीं लिखी है; pH मान पाठ में पढ़ें।

4. Aml + Kshar = Lavn + Pani

Jab aml aur kshar milte hain to ek doosre ko udaseen kar dete hain — ise udaseenikaran (neutralisation) kehte hain. Isme lavn (salt) aur pani banta hai. Example apne shabdon me: hydrochloric acid + sodium hydroxide → sodium chloride (khane wala namak) + pani. Yahi siddhant antacid, mitti ke pH ko theek karne aur kai factory processes me kaam aata hai.

5. Roz ki zindagi ke lavn — naam aur kaam

• Baking soda (sodium hydrogen carbonate): cake-phulane me, aur acidity me antacid ke roop me.
• Dhone ka soda (sodium carbonate): kapde dhone aur pani ki kathorta door karne me.
• Bleaching powder (calcium oxychloride): pani ko saaf karne aur kapdon ko safed karne me.
• Plaster of Paris (calcium sulphate hemihydrate): tooti haddi par plaster chadhane aur moortiyan banane me — pani milte hi ye jamkar sakht ho jaata hai.

6. Galatfahmiyan jo board me nuksan karti hain

Ek: sab khatti cheezein tez aml nahi hoti — nimbu ka ras halka aml hai, jabki gandhak ka acid bahut tez hai. Do: sab kshar khane layak nahi hote — sabun ka ghol kshar hai par use peena khatarnak hai. Teen: pH 7 se neeche jaana matlab aml badhna, aur 7 se oopar jaana matlab kshar badhna — ulta yaad mat karo.

Practice set — khud karke dekhein

1. Neela litmus lal kab hoga aur lal litmus neela kab? Ek-ek example dein.
2. pH 3, pH 7 aur pH 11 me se kaunsa ghol aml hai, kaunsa udaseen, kaunsa kshar?
3. Acidity me antacid kaam kaise karta hai? Udaseenikaran ke shabdon me samjhayein.
4. Baking soda aur dhone ke soda me ek farak aur har ek ka ek kaam likhein.
5. Plaster of Paris pani milte hi sakht kyun ho jaata hai? Apne shabdon me likhein.

Yaad rakhne ki trick: Litmus ka niyam ek line me — "Aml lal karta hai, kshar neela" (neele litmus ke liye ulta padho: aml me neela → lal).

Thoda aur samajh — pH ko roz se jodo

pH ko sirf number mat samjho — ise ek scale samjho jisme 7 beech ka point hai. 7 se neeche jaate hi ghol aml ki taraf badhta hai, aur 7 se oopar jaate hi kshar ki taraf. Isliye do gholon ki tulna karte waqt sirf ye mat dekho ki dono aml hain ya dono kshar — ye bhi dekho ki kaunsa 7 se kitna door hai, kyunki door wala zyada tez hoga. Yehi soch acidity, mitti ki jaanch aur pani ki safai wale sawaalon me kaam aati hai.

Related diagrams

Diagram 1 (image par Hindi labels lage hain): Teen flasks dikh rahe hain — ek me neeli patti, ek me laal patti, aur saath me ek nimbu aur sabun ki tikiya rakhi hai. Ye batata hai ki pehchaan ke liye sirf rang ya khatta-meetha swad kaafi nahi — litmus jaisi jaanch se hi pata chalta hai ki ghol aml hai ya kshar. Note: is image me pattiyan flask ke muh par lagi dikh rahi hain, ghol me doobi hui nahi — isliye ise pehchaan ke saadhanon ka overview samjhein.

Diagram 2 (image par Hindi labels lage hain): Pani ke glass me do safed goliyan ghul rahi hain aur bulbule uth rahe hain. Ye udaseenikaran ke vichaar ko dikhata hai — ek halka kshar, zyada acid ko kam kar deta hai. Note: goliyon par koi naam ya label nahi hai, isliye ye sirf ek aam misaal hai, kisi khaas dawa ki photo nahi.

Important Questions — परीक्षा के लिए ज़रूरी प्रश्न

1. Q: Aml aur kshar ko litmus se kaise pehchanoge? Hint / Answer: Aml neele litmus ko lal karta hai, kshar lal litmus ko neela karta hai.
2. Q: Haldi ek indicator kaise kaam karti hai? Hint / Answer: Kshar me haldi ka rang laal-bhura ho jaata hai, jabki aml me uska rang waisa hi rehta hai.
3. Q: pH 2, pH 7 aur pH 12 me se kaunsa sabse tez aml hai aur kaunsa sabse tez kshar? Hint / Answer: pH 2 sabse tez aml (7 se sabse door neeche), pH 12 sabse tez kshar (7 se sabse door oopar).
4. Q: Pet me zyada acid banne par antacid kaam kaise karta hai? Hint / Answer: Antacid ek halka kshar hai jo acid se milkar use udaseen karta hai — udaseenikaran.
5. Q: Aml aur kshar ki abhikriya ka samanya (general) roop likhein aur ek example dein. Hint / Answer: Aml + kshar → lavn + pani; jaise hydrochloric acid + sodium hydroxide → sodium chloride + pani.
6. Q: Baking soda aur dhone ke soda me kya farak hai? Hint / Answer: Dono alag lavn hain — baking soda khana phulane aur antacid me kaam aata hai, dhone ka soda kapde dhone aur pani ki kathorta door karne me.
7. Q: Bleaching powder pani saaf karne me kyun use hota hai? Hint / Answer: Kyunki ye pani ko saaf karne aur keetanu door karne ke kaam aata hai (upar ke notes ke hisaab se).
8. Q: Plaster of Paris se tooti haddi par plaster kyun chadhaya jaata hai? Hint / Answer: Kyunki pani milte hi ye jamkar sakht ho jaata hai aur haddi ko sahara deta hai.