Week 11 Challenge Problems-Saved to my Mac Mailings Review View Normal No Spacin

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Week 11 Challenge Problems-Saved to my Mac Mailings Review View Normal No Spacing Heading1 Heading 2 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), with 15 mL of 2.0 M NH.CI, which react according to the following reaction 1. 2NH CuCa) Ba(OH)2a) 2H,o+2NH, Caq)+Ba(ag)+C(aa) Next, she added 7.90 ml of 1.5 M Pb/(NO,h 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 formed. "assume no other reactions happen other than the given equation and any precipitation a. List all precipitates and their theoretical yields (in grams) b. List all aqueous components and give their final concentrations (in M)

Explanation / Answer

a)-when she added 7.90 ml of 1.5M lead nitrate , a solid solution act as precipitate lead chloride is formed.

b)-when she added 23.5 ml of 0.50 M sodium carbonate ammonia gas is released and strong base act as precipitate sodium hydroxide is formed.

ii)-Aqueous components: ammonia ,Barium, chloride

Barium: M=1000*weight in gram/molar mass*volume in ml

M=1000*w/171.34*10

1.5=1000*w/171.34*10

1.5*171.34*10/1000=w

w=2.57

b)-NH3=

2.5=1000*w/53.49*15

w=2.5*53.49*15/1000

w=2.00

c)-nitrate-

1.5=1000*w/331.2*7.90

w=1.5*331.2*7.90/1000

w=3.92

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