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rocking meenu

@rocking meenu

Inactive

+ 3

Posted: 12 years ago

#731

Originally posted by: Shona.Angel

nooo...i'm making my assignment and spamming sath me... i like physcs she hates it...she likes chem i hate it 😆

Waah kya JODI hai...😆

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shagun05

@shagun05

Dazzler

Posted: 12 years ago

#732

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Amna.

@Wrappedinblue

Dazzler

+ 3

Posted: 12 years ago

#733

Originally posted by: rocking meenu

Waah kya JODI hai...😆

yeh hi ik akeli cheez hai jahan thora akra hai baki sab same 😉

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rocking meenu

@rocking meenu

Inactive

+ 3

Posted: 12 years ago

#734

Originally posted by: ..SSNAIR..
😲NOOO000OOO0000OOO😡
i hate chemistry...
Maths is ma favorite 😃

Yeh lo...ek aur mahan...

I hate studying...😡

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Amna.

@Wrappedinblue

Dazzler

+ 3

Posted: 12 years ago

#735

Originally posted by: rocking meenu

Yeh lo...ek aur mahan...

I hate studying...😡

LOLLOL i hate MATHS...but better than chem

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Amna.

@Wrappedinblue

Dazzler

+ 3

Posted: 12 years ago

#736

In a solution of acetic acid, the equilibrium concentrations are found to be [CH₃COOH] = 1.000; [CH₃COO^-] = 0.0042. Evaluate the pH of this solution and the equilibrium constant of ionization of acetic acid.

Solution
From the ionization of acetic acid,

CH₃COOH = CH₃COO^- + H⁺
0.100 0.0042 0.0042we conclude that
[H⁺] = [CH₃COO^-]
= 0.0042.
Thus, pH = -log0.0042 = 2.376.

The equilibrium constant of ionzation,

(0.0042)²
K = ------------- = 1.78x10^-5
1.000

Discussion
The equilibrium constant of an acid is represented by Ka; and similar to the pH scale, a pKa scale is defined by

pKa = - log Ka

and for acetic acid, pKa = 4.75. Note that Ka = 10^-pKa

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siamesecat

@siamesecat

Voyager

Posted: 12 years ago

#737

Finally! We are getting somewhere with this unique story! Yeah!! Do update asap!!

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Amna.

@Wrappedinblue

Dazzler

+ 3

Posted: 12 years ago

#738

Acids

Strong

HCl (hydrochloric acid)
HNO3 (nitric acid)
H2SO4 (sulfuric acid)
HBr (hydrobromic acid)
HI hydroiodic acid
HClO4 (perchloric acid)

Weak

CH3COOH (acetic acid)
HCOOH (formic acid)
HF (hydrofluoric acid)
HCN (hydrocyanic acid)
HNO2 (nitrous acid)
HSO4- (hydrogen sulfate ion)

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Amna.

@Wrappedinblue

Dazzler

+ 3

Posted: 12 years ago

#739

Originally posted by: siamesecat
Finally! We are getting somewhere with this unique story! Yeah!! Do update asap!!

Strong acids and pH

pH is a measure of the concentration of hydrogen ions in a solution. Strong acids like hydrochloric acid at the sort of concentrations you normally use in the lab have a pH around 0 to 1. The lower the pH, the higher the concentration of hydrogen ions in the solution.

Defining pH