YE DEFINITION KYUN? Chemistry particles ke beech hoti hai. Hum particles scoop nahi kar sakte, lekin agar hum concentration jaante hain aur ek measured volume dalte hain, toh hum exactly jaante hain ki humne kitne moles (aur isliye particles) diye.
Moles of solute per litre of solution, c=n/V, unit mol L⁻¹ (M).
Moles, concentration, volume ko link karne wala master relation batao.
n=cV.
Dilution ke liye c1V1=c2V2 kyun hold karta hai?
Solvent dalna volume badlata hai lekin koi solute nahi dalta, toh moles n=cV conserved rehte hain.
Titration mein A ke moles ko B ke moles se kaun jodta hai?
Balanced equation se mole ratio: nA/a=nB/b.
aA+bB ke liye general titration formula do.
acAVA=bcBVB.
Equivalence point aur end point mein difference.
Equivalence point = stoichiometrically exact reaction; end point = observed indicator colour change (ideally coincide hone chahiye).
H2SO4+2NaOH ke liye moles kaise relate karte hain?
nNaOH=2nH2SO4.
n=cV mein titration ka kaun sa volume jaata hai?
Us solution ka delivered/pipetted volume, na ki mixed total.
Back-titration mein reacted moles ka formula.
nreacted=nexcess added−nleftover titrated.
Kya c1V1=c2V2 mein dono taraf mL use kar sakte hain?
Haan — units cancel hote hain jab tak dono sides ek hi volume unit use karein.
Recall Feynman: 12-saal ke bacche ko samjhao
Orange squash imagine karo. Concentration hai kitna strong taste karta hai. Paani milana (dilution) use kamzor banata hai, lekin orange syrup ki miqdar andar bilkul wahi rehti hai — tum bas use zyada paani mein phailaate ho. Isliye c1V1=c2V2: syrup multiply nahi hoti.
Titration aisa hai: tumhare paas mystery-strength lemon juice hai aur tum dheere dheere baking-soda water ki boondein dalte ho jab tak fizzing bilkul band na ho jaye. Tum jaante ho tumhara baking soda kitna strong hai aur kitni boondein lagin, toh — recipe (balanced equation) use karte hue jo kehti hai "1 lemon ko 1 soda chahiye" — tum peeche kaam karke pata lagate ho lemon kitna strong tha. Recipe magic bridge hai.
