You worked through developing a solution map in Part A, its corresponding dimens

Question

You worked through developing a solution map in Part A, its corresponding dimensional analysis in Part B. and how to incorporate other conversions into dimensional analysis in Part C. Use these steps to solve a real world example that applies solution maps and dimensional analyses. Transition metals (also called heavy metals) form insoluble compounds with hydroxide ions. Therefore, it is possible to extract heavy metal ions from water by raising the pH. The precipitation reaction between nickel(III) and hydroxide is shown below. Ni^3+(aq) + 3OH^-(aq) Ni(OH)3(s) If you had a 0.650L solution containing 0.0230M of Ni^3+(aq), and you wished to add enough 1.29M NaOH(aq) to precipitate all of the metal, what is the minimum amount of the NaOH(aq) solution you would need to add? Assume that the NaOH(aq) solution is the only source of OH^-(aq) for the precipitation. Express the volume to three significant figures and include the appropriate units.

Explanation / Answer

from the equation 1 mole Ni+2(n1) = 3 mole OH-(n2)

M1V1/n1 = M2V2/n2

0.65*0.023/1 = 1.29*V2/3

V2 = vol of NaOH required = 0.0348 L = 34.8 ml

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