What is the molar ratio of base/salt in colchicine base...

What is the molar ratio of base/salt in colchicine base solution buffered to $\mathrm{pH} 1.8$, using a $\mathrm{K}_{\mathrm{a}}$ of colchicine of $2.23 \times 10^{-2}$ at $25^{\circ} \mathrm{C}$ ?

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Key Concepts

Buffer Solutions

A buffer solution is a solution that minimizes changes in pH when small amounts of acid or base are added. It contains a weak acid and its conjugate base (or a weak base and its conjugate acid) in equilibrium, which helps to maintain a relatively constant pH in the system.

Acid-Base Equilibrium

Acid-base equilibrium refers to the state of dynamic balance between an acid and its conjugate base in a solution. This equilibrium is governed by the acid dissociation constant (Ka), which quantifies the strength of the acid by expressing the extent to which it donates protons to the solution.

Henderson-Hasselbalch Equation

The Henderson-Hasselbalch equation is a key tool used to relate the pH of a buffer solution to the pKa of the weak acid and the ratio of the concentrations of the conjugate base to the acid. It provides a straightforward calculation for determining the required proportions of acid and conjugate base to achieve a desired pH, emphasizing the logarithmic nature of the relationship.

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