Ka= [h+][HCO3-]/[H2CO3]
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The Ka value for the equilibrium reaction: H2CO3(aq) ⇌ H+(aq) + HCO3-(aq) is a measure of the strength of the weak acid H2CO3. The exact value of Ka will depend on the temperature and concentration of the solution, but for a typical solution at room temperature, the Ka value is approximately 4.3 x 10^-7.
H2CO3 is atype of ionization which depend on two steps as following :H2CO3 H+ + HCO3- HCO3- H+ + CO3-2
When HCO3- acts as a Bronsted base, it accepts a proton (H+) to form H2CO3 (carbonic acid).
ka=[H+][CN-]/[HCN]
The conjugate acid of HCO3- is H2CO3 (carbonic acid). When HCO3- accepts a proton (H+), it forms H2CO3. This reaction illustrates the Bronsted-Lowry concept of conjugate acids and bases, where the base (HCO3-) accepts a proton to become its conjugate acid (H2CO3).
Ka= [H+] [H2BO3-] / [h3BO3] (Apex)