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A 0.100 mol/kg solution of the acid HX is found to have 0.00055 mol/kg of H3O+....

A 0.100 mol/kg solution of the acid HX is found to have 0.00055 mol/kg of H3O+. Find the Ka for this acid.

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Answer #1

SOLUTION :

INITIAL CONCENTRATION OF [HX] = X M = 0.1 M

[ H3O+] = 0.00055 M

REACTION :
HX + H2O    H3O+ +

INITIALLY 0.1 M 0 M 0 M

CHANGE - X M X M    X M

EQUILIBRIUM (0.1 -X) M X M X M

  

FOR THIS WEAK ACID REACTION

M

SUMMARY :

M

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