Question

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 in this sample.

 Incorrect. Tries 4/5 Previous Tries

If the actual mass of the original sample in this experiment was 0.0733 g (instead of the theoretically calculated mass) -- indicating that the original Ni(NH3)6(NO3)2 complex had lost some ammonia -- what would be the corresponding value of n in the revised formula Ni(NH3)n(NO3)2. Enter your answer to 2 decimal places.

 Tries 0/5

Calculate the percent loss of ammonia which accounts for the difference in the theoretical and actual mass of the initial sample.
Enter your answer to three significant figures.

%

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