2. The nickel in a 0.3824 g sample of an ore is precipitated with dimethylglyoxime. If...
The nickel in a 0.3824 g sample of an ore is precipitated with dimethylglyoxime. If the ore contains 15.4% Ni, what does the precipitate of nickel dimethylglyoxime weigh in grams? (Hint: dimethyglyoxime is a bidentate ligand.)
10) How many mL of dimethylglyoxime at 2.15% by weight in alcohol should be used to have an excess of 10% in the reaction with nickel if 0.9984 grams of a steel with 2.07% by weight of nickel is used. Suppose that the density of the dimethylglyoxime solution is 0.790 g/mL? Precipitate Formed Precipitate Weighed Analyte Precipitant Structure Ni2 Ni(C4H2O2N2)2 Ni(C4H2O2N2)2 dimethylglyoxime HON NOH
hexahydrate 3. A lab student analyzed her nickel-en complex for ethylenediamine, en, content. A 0.579 g sample of the synthesized Ni-en complex was dissolved in about 50 mL of water and titrated with 0.181 M HCl (ag). Endpoint required 38.02 mL of the HCl (ag). What is the mass (in grams) of en in the Ni-en complex analyzed? a. 0.153 g b. 0.207 g c. 0.413 g d. 0.104 g e. 0.199 g 4. Continuing on with the analysis of...
1. A certain ore is 24.6% nickel by mass. How many kilograms of this ore would you need to dig up to have 15.0 g of nickel? 2. How many grams of salt are needed to make 613 g of saltwater that is 31.5% salt by mass?
A 5.000 gram sample of hydrated nickel (II) cyanide, Ni(CN)2·xH2O is heated according to the procedure described in this laboratory. After heating, the sample is found to weigh 3.029 grams. How many moles of H2O were present in the sample? How many moles of Ni(CN)2 were present?
A solid sample of a complex salt, with ideal composition Ni(NH3)6(NO3)2, was analyzed for nickel by dissolution in slightly acidic solution and precipitation as the dimethylglyoximate, Ni(DMG)2. A sintered glass crucible of mass 13.2379 g was used to filter off the precipitate. The dried crucible and precipitate had a combined mass of 13.3319 g. Calculate the theoretical mass of the original Ni(NH3)6(NO3)2 sample. 0.0927 g You are correct. Your receipt no. is 152-9832 Previous Tries Calculate the mass of nickel...
Question 2 (5 marks) A nickel ore contains the following valuable and gangue minerals: Valuable minerals: minor millerite (NiS), major pentlandite (Fe,Ni)Ss) Gangue minerals: minor pyrite (FeS2), major Lizardite (MgsSi2Os(OH)) Xanthate, polypropylene glycol, copper sulphate, carboxy methyl cellulose (CMC) and lime are used in the flotation of this nickel ore to separate valuable minerals from gangue minerals. Explain the role of each of the reagents used in this process.
1. A 5.000 gram sample of hydrated nickel (II) cyanide, Ni(CN)2·xH2O is heated according to the procedure described in this laboratory. After heating, the sample is found to weigh 3.029 grams. How many moles of H2O were present in the sample? How many moles of Ni(CN)2 were present? 2. Determine the empirical formula of the hydrated salt from question 1. Write your answer in the format, Ni(CN)2∙ x H2O, where “x” is an integer.
A 10.00 mL sample of an unknown aqueous nickel(II) solution (density = 1.00 to produce 0.0532 g of Ni(DMG)2 (Molar Mass=288.9155g/mol) precipitate. aqueous nickel(II) solution (density = 1.00 g/mL) was treated and found of nickel in the unknown solution. olar Mass - 288.9755e/molnrecinitate. Calculate the mass percentage
A lab student analyzed her nickel-en complex for ethylenediamine, en, content. A 0.579 g sample of the synthesized Ni-en complex was dissolved in about 50 mL of water and titrated with 0.181 M HCl (aq). Endpoint required 38.02 mL of the HCl (aq). What is the mass (in grams) of en in the Ni-en complex analyzed?