Complete and balance each of the following equations. If no reaction occurs, write no reaction.
a. NaOH(aq) + FeBr3(aq) →
b. BaCl2(aq) + AgNO3(aq) →
c. Na2CO3(aq) + CoCl2(aq) →
d. K2S(aq) + BaCl2(aq) →
Express your answer as a chemical equation. Enter no reaction if no precipitate is formed.