For the reinforced concrete bench below: (1) sketch the expected loading conditi

Question

For the reinforced concrete bench below: (1) sketch the expected loading conditions for the structure; (2) sketch the approximate deflected shape and bending moment diagram for each loading condition; and (3) sketch the locations for reinforcement. A 5.99 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 5.86 ppm Ni. Determine the molarity of Ni in the 20.0 mL solution. Determine the mass in grams of Ni in the original sample. Determine the weight percent of Ni in the sample.

Explanation / Answer

mass of sample = 5.99 grams

volume of sample solution = 20 ml

aliquot = 5 ml

diluted to 100 ml

mass of Ni in diluted sample = 5.86*100/10^6 = 0.000586 grams

so that mass of Ni in 20 ml sample = 0.000586*4 = 0.002344 grams

Molarity of solution = (0.002344/58.7)*(1000/20) = 0.002 M

mass of Ni in original sample = 0.002344 grams

percent of Ni in the sample = (0.002344/5.99)*100

   = 0.04%

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