What did robert boyle teach in the 1600s?

Robert Boyle was a founding member of the anti-scholastic 'invisible college' which later became the Royal Society in 1645. He worked at the propagation of Christianity - especially in India and financed series of lectures and published books to further this project. 

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -