2/5/2018 11:55 PM 30/10° Print calculator-Periodic Table estion 4 of 10 Incorrec

Question

2/5/2018 11:55 PM 30/10° Print calculator-Periodic Table estion 4 of 10 Incorrect Map Sapling Learning A 5.73 g sample of a solid containing Ni is dissolved in 20.0 mL water. A 5.00 mL aliquot of this solution is diluted to 100.0 mL and analyzed in the lab. The solution was determined to contain 6.16 ppm Ni. Determine the molarity of Ni in the 20.0 mL solution. Number Determine the mass in grams of Ni in the original sample Number Determine the weight percent of Ni in the sample Number O Previous Give Up & View Soluton e Check Answer O Next Exit

Explanation / Answer

Conc of Ni in the 100 mL solution analyzed = 6.16 ppm = 6.16 mg/L

So,

Conc of Ni in the 5 mL aliquot = 6.16*(100/5) = 123.2 mg/L = 0.1232 g/L

Moles of Ni per liter = Mass/MW = 0.1232/58.7 = 0.00209

So,

Conc of Ni in the 20 mL solution = 0.00209 M

Total mass of Ni in the sample = 0.1232*0.02 = 0.002464 g

So,

Mass % of Ni in the sample = (0.002464/5.73)*100 = 0.043%

Hope this helps !

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