The equilibrium constant for the acid ionization of mercaptoethanol (HSCH2CH2OH) is HSCH2CH2OH(aq) = H+(aq) + SCH2CH2OH-(aq)               k= 1.91 x 10-10 Which of the following is/are true regarding this equilibrium? And why? 1. The reaction is product-favored. 2. The reaction is reactant-favored. 3. Equilibrium lies far to the right. 4. Equilibrium lies far to the left.

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