how to know which one is stronger scid n stronger base

how to know which one is stronger scid n stronger base


1 Answers

879 Points
12 years ago

Dear student,

The strength of acids and bases are dependent on their ionization constant (Ka and Kb, respectively) values.

1. Assuming all three have the same concentrations,

Reason: HCl is a strong acid. It is a 'given' (usually, strong acids have the formula HX, where X is a halogen). CH3COOH has a Ka value of 1.8x10^-5 while H2CO3 has a Ka value of 4.2x10^-7. The higher the Ka or Kb, the stronger it is.

2. Assuming both have the same concentrations,
OH- is a stronger base. Again, this is sort of a 'given'. Or another way to approach this problem is that NH3 has a Kb value of 1.8x10^-5.

NH4+ is a stronger acid. Remember this, "the conjugate acid of a weaker base is a stronger acid". Since NH4+ is the conjugate acid (has one H+ or one proton extra) of NH3, it is stronger than H2O, the conjugate acid of water.


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All the best.

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

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