Ka1= H₃PO₄+H₂0⇌H₃O⁺+H₂PO₄⁻
Ka2= H₂PO₄⁻+H₂O⇌H₃O⁺+HPO₄⁻²
Ka3= HPO₄⁻²+H₂O⇌H₃O⁺+PO₄⁻³
Phosphate acid includes Triprotic acid and weak acid, which will be ionized in 3 stages
According to Arrhenius, acids are substances which, when dissolved in water, release Hions.
An HₓY acid in water will ionize:
HₓY (aq) --------> xH⁺ (aq) + Yˣ- (aq)
Example:
HCl -------> H⁺ + Cl⁻
The amount of Hions produced by 1 acid molecule is called valence acid, whereas acidic residuals are formed after the release of Hions.
Usually, the name acid begins with the word acid followed by the name of the remaining acidic ion
The ion concentration of a weak acid is determined by the value of the acid ionization constant (Ka).
The greater the value of Ka, the greater the dissociated acid produces its Hion and the greater its acidity
Based on the number of protons (H ⁺) released, acids can be divided into:
• 1. Monoprotic acid is an acid which releases one H + ion such as HCl, HCN, HNO₃
• 2. Polyprotic acid which is an acid that releases more than one H⁺ ion.
This acid can be divided into two:
In general, the weak acid ionization reaction
HA (aq) ---> H⁺ (aq) + A⁻ (aq)
Ka's value
[tex] \large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}} [/tex]
Phosphate acid includes Triprotic acid and weak acid which will be ionized in 3 stages :
Ka = Ka₁ x Ka₂ x Ka₃
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