$\frac{{\left[\mathrm{HA}\right]}_{\mathbf{initial}}}{{\mathbf{K}}_{\mathbf{a}}}\mathbf{=}\frac{\mathbf{0}\mathbf{.}\mathbf{01}\mathbf{}\mathbf{M}}{\mathbf{1}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{5}}}\mathbf{=}$**1000**

For many weak acid or weak base calculations, you can use a simplifying assumption to avoid solving quadratic equations.

Classify these situations by whether the assumption is valid or the quadratic formula Is required.

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