Challenge Problems HW 9, Week 11 Due week of 4/2 Bill Nye\'s daughter, Pink Nye,

Question

Challenge Problems HW 9, Week 11 Due week of 4/2 Bill Nye's daughter, Pink Nye, gets carried away in lab and mixes several salt solutions together. First, she mixed 10 mL of 1.5 M Ba(OH)2 with 15 mL of 2.0 M NH,CI, which react according to the following reaction: 1. 2NH4CI(aq)Ba(OH)2(aq) 2H20()2NH3(a)Ba (aq) Cl (a?) Next, she added 7.90 mL of 1.5 M Pb(NO3) and a white precipitate formed. She centrifuged (you can ask your TA what this means) the solution down so that the precipitate was collected at the bottom of her flask. Lastly, she added 23.5 mL of 0.50 M Na CO, and more white solid formec. assume no other reactions happen other than the given equation and any precipitation reactions a. List all precipitates and their theoretical yields (in grams) ABb. List all aqueous components and give their final concentrations (in M)

Explanation / Answer

Precipitates:

1) PbCl2

2) BaCO3

Milimoles of NH4Cl = 15 x 2 = 30

Milimoles of Ba(OH)2 = 10 x 1.5 = 15

Both the reactants will completely react to form:

Milimoles of Ba2+ = 15

Milimoles of Cl- = 30

Milimoles of Pb(NO3)2 = 7.9 x 1.5 = 11.85

Milimoles of PbCl2 formed = 11.85

Theoretical yield = 11.85 x 278.1 = 3.295 g

Milimoles of Na2CO3 added = 23.5 x 0.5 = 11.75

Milimoles of BaCO3 formed = 11.75

Theoretical Yield = 11.75 x 197.34 = 2.318 g

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.