ques 27 KM Write the balanced equation for the reaction of a

ques 27 K-M

Write the balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI. Include phases.

What mass of precipitate will form if 1.50 L of highly concentrated Pb(ClO3)2 is mixed with 0.500 L of 0.270 M NaI? Assume the reaction goes to completion.

Solution

Pb(ClO3)2 (aq) & 2 NaI (aq) --> PbI2 (s) & 2 NaClO3 (aq)


find moles
0.500 L (0.270 mol / Litre) NaI = 0.135 moles of NaI

by the equation
Pb(ClO3)2 (aq) & 2 NaI (aq) --> PbI2 (s) & 2 NaClO3 (aq)
0.135 moles of NaI produces 1/2 as many moles of PbI2 = 0.0675 moles PbI2

use molar mass to find grams:
0.0675 moles PbI2 ( 461.02 grams / mol PbI2) = 31.12 grams of PbI2