## Related questions with answers

Consider a 0.60-M solution of $\mathrm { HC } _ { 3 } \mathrm { H } _ { \mathrm { 5 } } \mathrm { O } _ { 3 } ,$ lactic acid $\left( K _ { a } = 1.4 \times 10 ^ { - 4 } \right).$ a. Which of the following are major species in the solution? i. $\mathrm { HC } _ { 3 } \mathrm { H } _ { 5 } \mathrm { O } _ { 3 },$ ii. $\mathrm { C } _ { 3 } \mathrm { H } _ { 5 } \mathrm { O } _ { 3 } ^ { - },$ iii. $\mathrm { H } ^ { + },$ iv. $\mathrm { H } _ { 2 } \mathrm { O },$ v. $\mathrm { OH } ^ { - }.$ b. Complete the following ICE table in terms of x, the amount (mol/L) of lactic acid that dissociates to reach equilibrium.

$\begin{matrix} & \text{$\left[ \mathrm { HC } _ { 3 } \mathrm { H } _ { 5 } \mathrm { O } _ { 3 } \right]$} & \text{$\left[ \mathrm { H } ^ { + } \right]$} & \text{$\left[ \mathrm { C } _ { 3 } \mathrm { H } _ { 5 } \mathrm { O } _ { 3 } ^{-} \right]$}\\ \hline \text{Initial} & \text{\_\_\_\_\_\_\_\_\_\_\_\_} & \text{\_\_\_\_\_\_\_\_\_\_\_\_} & \text{\_\_\_\_\_\_\_\_\_\_\_\_}\\ \text{Change} & \text{\_\_\_\_\_\_\_\_\_\_\_\_} & \text{\_\_\_\_\_\_\_\_\_\_\_\_} & \text{\_\_\_\_\_\_\_\_\_\_\_\_}\\ \text{Equilibrium} & \text{$0.60 - x$} & \text{\_\_\_\_\_\_\_\_\_\_\_\_} & \text{\_\_\_\_\_\_\_\_\_\_\_\_}\\ \end{matrix}$

c. What is the equilibrium concentration for $\mathrm { C } _ { 3 } \mathrm { H } _ { 5 } \mathrm { O } _ { 3 } ^ { - } ?$ d. Calculate the pH of the solution.

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