Shrektacular
New member
Could I be more confused?
An analytical chemist was contracted by a mining company to determine the percentage of nickel in an ore which was known to be mainly hydrated nickel (ll) carbonate of formula NiCO3.xH2O. [Assume that the impurities in the ore are inert and do not react chemically in any testing procedure.]
The chemist took a 5.750g sample of the ore and heated it strongly to drive off all the water of crystillisation. The dry anhydrous powder (nickel carbonate + impurities) remaining weighed 4.164g. This powder was then dissolved in excess nitric acid. The resulting solution was then diluted to 1.00L by the addition of distilled water, and was then electrolysed with inert electrodes until the mass of the cathode finally remained constant, indicating that all the nickel in the solution had been deposited at the cathode. The gain in mass of the cathode was 1.707g.
From the above information, calculate:
(a) the value of x (ie determine the formula of the hydrated nickel carbonate.)
(b) the percentage of hydrated nickel carbonate in the ore.
Anyone game enough???
An analytical chemist was contracted by a mining company to determine the percentage of nickel in an ore which was known to be mainly hydrated nickel (ll) carbonate of formula NiCO3.xH2O. [Assume that the impurities in the ore are inert and do not react chemically in any testing procedure.]
The chemist took a 5.750g sample of the ore and heated it strongly to drive off all the water of crystillisation. The dry anhydrous powder (nickel carbonate + impurities) remaining weighed 4.164g. This powder was then dissolved in excess nitric acid. The resulting solution was then diluted to 1.00L by the addition of distilled water, and was then electrolysed with inert electrodes until the mass of the cathode finally remained constant, indicating that all the nickel in the solution had been deposited at the cathode. The gain in mass of the cathode was 1.707g.
From the above information, calculate:
(a) the value of x (ie determine the formula of the hydrated nickel carbonate.)
(b) the percentage of hydrated nickel carbonate in the ore.
Anyone game enough???