A laboratory investigation combines three separate aqueous solutions in a single…
CHEMISTRY · Multi-part · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
A laboratory investigation combines three separate aqueous solutions in a single beaker at 20 °C in the following order:
1. 25.0 mL of 0.200 M Pb(NO_{3})_{2}
2. 10.0 mL of 0.300 M Na_{2}CO_{3}
3. 15.0 mL of 0.400 M HCl
Assume all volume changes are additive and that only one precipitate forms.
(a) Calculate the initial millimoles of each ionic species present before any reaction occurs.
(b) Using solubility rules, predict which two ionic species form the precipitate and write an unbalanced net ionic equation for its formation.
(c) Balance the net ionic equation obtained in part (b), ensuring integer coefficients and conservation of charge.
(d) Determine the limiting reactant for the precipitation process and calculate the theoretical mass (in grams) of solid produced.
(e) After precipitation, the remaining aqueous mixture is acidified by the addition of HCl. Predict whether any further precipitation or dissolution occurs and justify your answer with reference to the balanced net ionic equation from part (c) and relevant equilibrium considerations.