a simple qoestion

JEE Mains 2015 Tutorials › Physical Chemistry questions › a simple qoestion

find the pH of 10^-8 N HCl solution

#Chemistry #Physical Chemistry

UP 0 DOWN 0 0 7
Post on FacebookPost anonymously?

7 Answers

1

ANKIT MAHATO ·2009-03-20 00:09:26

â‰ˆ 7
6.9...

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

rahul nair ·2009-03-20 00:16:29

[H+]=10^{-8}
[H+]w=10^{-7} thus, total H+ions =10^{-7}+10^{-8}=1.1\times10^{-7}
taking -ve log of both sides, pH=6.958

UP 0 DOWN 0
Post on FacebookPost anonymously?

13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-03-20 00:22:56

At 25Â°C

[H⁺]*[OH^-]=10^-14

if x gram-ion/lit is [H⁺]from water

then (x+10^-8)*x=10^-14

x=9.51*10^-8(more accurately)

hence total conc.=9.51*10^-8+10^-8

hence pH=-log(1.051*10^-7)=6.978

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

rahul nair ·2009-03-20 00:31:24

here common ion effect is too small to be considerd......

UP 0 DOWN 0
Post on FacebookPost anonymously?

13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-03-20 00:39:33

hey rahul...i did the same in exams like u...and got a zero...[17]

i won't do it again...[4]

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

ANKIT MAHATO ·2009-03-20 02:27:32

matlab .. my answer was the best .. [1] .. approximation rules ...

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

skygirl ·2009-03-20 07:58:22

common ion if not considered will give a PH >7 ..

and its impossible since it is an acid..

UP 0 DOWN 0
Post on FacebookPost anonymously?

Your Answer

Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω