Problem: One mole of a weak acid HA was dissolved in 2.0 L of solution. After the system had come to equilibrium, the concentration of HA was found to be 0.45 M. Calculate Ka for HA.

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FREE Expert Solution

To calculate Ka for HA


Ka expression 


Ka=productsreactants=[H3O+][A-][HA]


Step 1: [HA]initial (molarity)


Molarity, [HA]=moles HAL solution[HA]=1.0 mol HA2.0 L

[HA]initial = 0.5 M 


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Problem Details

One mole of a weak acid HA was dissolved in 2.0 L of solution. After the system had come to equilibrium, the concentration of HA was found to be 0.45 M. Calculate Ka for HA.