An Unknown Chloride

In this experiment, you will determine the percent mass of an unknown sample that is due to chloride. The sample is a mixture of NaCl and MgCl₂.

The Procedure is as follows:

1. Obtain about 1 g of an uknown sample.
2. Dissolve the sample in water.
3. Precipitate all of the chloride by reacting with an excess fo AgNO₃.
4. Filter and dry the nacient AgCl(s).

Based on the results, you should be able to calculate

• the number of moles of Cl^- in the original sample
• the percent by mass of the original sample due to chlorine
• the percent by mass of the original sample due to sodium chloride

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