Wednesday
July 1, 2015

Homework Help: General Chemistry

Posted by Dave on Tuesday, October 12, 2010 at 1:26am.

A student dissolved 4.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?

0.0197 g

0.0394 g

0.0542 g

0.108 g


Don't understand it. I keep getting 0.394 g as my final result.
1. (0.218639 M)(0.00400 L) = (x M)(0.275 L)
= 0.00318 M Co(NO3)2
2. 0.00318 M Co(NO3)2 x 2 mol NO3- / 1 mol Co(NO3)2 x 62 g NO3- / 1 mol NO3- = 0.394 g NO3-

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