Please calculate the Ka for a weak acid given the following data: pH = 6.84, and an initial acid concentration of 1.43 x 10* M (note: please express your answer with 3 sig figs.; the equilibrium reaction is shown below:) НА (аq) + H,0 () H,O* (aq) + A (aq)

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Photochemistry

Photochemistry is the part of chemistry that studies the various mechanisms of reactions that are triggered by the presence of light energy. It also helps to study the changes involved in a molecule that can undergo the absorption of radiation.