he tablet mL of this solution is added to 9. A tablet, with a mass of 1.545 g, i

Question

he tablet mL of this solution is added to 9. A tablet, with a mass of 1.545 g, is analyzed for the amount of zinc it contains. T is dissolved in water to make 2.00 L of solution. 3.00 reagents and water to give 100.0 mL of a sample that is found to be 2.24 ppm in zinc. What is the percentage of zinc in the tablet, and how many mg of zinc are in the w tablet? 10. An enologist has prepared 1000. Liters of zinfandel wine. Unfortunately some of the sulfur sprayed on the grapes to prevent insect damage has gotten into the solution and has been reduced to the sulfide ion, giving the wine a slight fragrance of rotten eggs. The wine is analyzed and found to be 436 ppm in sulfide ion. What mass of copper (II) chloride should be added to the wine to precipitate all of the sulfide and leave no, copper ion residue (which is toxic): Cu, S CuS

Explanation / Answer

Q9

m = 1.545 g

V = 2 L solution

then, we take V = 3 mL

ppm Finz = 2.24 ppm

recall that

ppm = mg of Zn / Liter solution

2.24 mg of Zn / Liter

if we have 100 mL --> 2.24*100/1000 = 0.224 mg of Zn

this was diluted from

3 mL * C1 = 100 mL * C2

3 mL * C1 = 0.224 mg of Zn

C1 = 0.224 mg / 3 mL = 0.07466 mg/mL

this is the 3 mL solution

now..

total mass sample = 1.545 g

% mass of Zn = 0.07466*10^-3 g / 1.545 * 100

% mass of Zn = 0.004832 %

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