To measure the amount of nickel in some industrial waste fluid, an analytical chemist adds 0.110 M sodium hydroxide (NaOH) solut
ion to a 25.0 g sample of the fluid and collects the solid nickel(I) hydroxide (Ni (OH2) product. When no more Ni(OH)2 is produced, he filters, washes and weighs it, and finds that 343. mg has been produced The balanced chemical equation for the reaction is: Ni2+(aq) + 2NaOH(aq) Ni(OH)2(s) + 2 Na. (ag) R precipitation | | o acid-base o redox Og Dx10 Ar What kind of reaction is this? If you said this was a precipitation reaction, enter the chemical formula of the precipitate. If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base. If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized. Calculate the mass percent of Ni in the sample. Be sure your answer has the correct number of significant digits.
The molecular formula of sucrose is - C₁₂H₂₂O₁₁ molecular mass of sucrose - 342 g/mol molarity of sucrose solution is 0.758 M In 1 L solution the number of sucrose moles are - 0.758 mol Therefore in 1.55 L solution, sucrose moles are - 0.758 mol/L x 1.55 L = 1.17 mol The mass of 1.17 mol of sucrose is - 1.17 mol x 342 g/mol = 4.00 x 10² g
