Will precipitation occur when the following solutions are mixed? If so, write a balanced chemical equation for the reaction. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer. Enter "NONE" if no reaction occurs. )
(a) Na2CO3 and AgNO3
(b) NaOH and K2SO4
(c) FeSO4 and Pb(NO3)2